I would suggest a visit to the mayor's office and/or the police expressing the intent to cleanse/bless a crime scene when their work is done.
In the US, police departments and fire departments typically have volunteer chaplains. Their role varies. For example, fire department chaplains mainly assist the firefighters when responding to a medical call where the patient is found to be deceased. Police department chaplains do some of the same, and also help with dead body reports. They also provide counseling to the police and firefighters as required. They come from a variety of religions; one of my good friends is a chaplain with the local fire department, and she is ordained with the Presbyterian Church USA and is a very practical lady. Now some of these chaplains are definitely going to be blessing incident sites in llne with their religion, for example, I expect some Roman Catholic priests might have consecrated salt or water, but they are not going to make a show out of it, as chaplains are there for everyone, although efforts are made to match chaplains with people of the same faith, for example, if a Sikh person dies and there is a Sikh chaplain, that would be the guy to call. If a Catholic dies, you would call the padre, if a Presbyterian dies, you would call my friend, except in many cases its not possible for someone of the same faith to respond in a timely manner, so all chaplains are prepared to help everyone. They function on the same principles as chaplains in the military.
Additionally it is a civil right to have blessings where events have occurred.
Now frankly I don’t understand what the big deal is here, in that if a member of the Maori religion performed their blessing, that’s fine, provided no one is impeding the efforts of Christian clergy to do likewise. It can be convenient for all parties to coordinate such events, not for reasons of syncretism, but rather so that specific times can be arranged for such to occur. And this is common in response to major disasters or horrific crimes.
I remember once many years ago in the city I lived in for much of my life, a 13 year old boy was killed in an incident of gang violence, and there was a broad outpouring of grief from around the city; it was quite horrific as he was found hanged in his parents’ garage, by a relative, if I recall, and it led to a major local crackdown against the Mexican mafia groups known as the Nortenos and Surrenos, and related groups, which were tied into the cartels, as these gangs were heavily involved, and still are heavily involved, in drugs.
Likewise on 9/11, which was a national tragedy in the US, literally every church and synagogue most other religious organizations had prayer events in response to the incident. In many cases these were coordinated, so my church had a joint service of prayer with the PCUSA, and during the service, which lasted for at least a couple of hours, we had chalkboards on which we kept track of members of the local community who had been affected by the disaster, for example due to the loss of a loved one.
On a brighter note, in 1969 the landing of Apollo 11 resulted in many religious leaders ranging from Pope Paul VI to a noted Shinto priest praying or offering blessings for the religion. Additionally, Buzz Aldrin, who was a deacon in his Presbyterian church, was given by his pastor a kit by which he was able to take communion after the Eagle touched down on the Lunar surface. I absolutely love the fact that one of the first things to happen after mankind landed for the first time on another planet was the partaking of the Eucharist. This is also broadly acceptable as most denominations allow deacons to handle the Eucharist, for example, historically a major role for deacons was to distribute the reserved sacrament to the infirm, and frequently deacons assist in the ministration of the Eucharist, which I regard as more appropriate than lay Eucharistic ministers (if there is a shortage of deacons, which there often is, ordain more of them; in the US ROCOR and the OCA and the RCC have done an excellent job ordaining permanent deacons who have stable positions in the community, and ROCOR has an online education program for prospective deacons, and this is great, because liturgies tend to be better if one has a deacon present, even the Novus Ordo Missae). The main challenge is simply ensuring proper supervision of deacons, but I think if deacons are restricted to a liturgical ministry during scheduled church services initially and only after additional vetting qualified for home visits for the infirm, that would be ideal, and ideally these are people already known in the church.
