http://trustfunding.org.uk/search.aspx
You might find some grant funders willing to part fund the cost, there’s plenty of grant giving medical trusts out there, if you can find a local one your case might be stronger. I’d also be looking around at local businesses and notable individuals, some people are very well connected when it comes to charitable activity and are good at getting publicity as well as finding money. You’ll want to put a lot of effort into the ‘case for support’ you’ll need for this. These sort of funders will see plenty of tragedy and have to make hard decisions about what they do with their money.
It’s a bit out there but…. One thing you might consider is looking at is actually setting up a charity with the intent of the charity becoming a ‘thing’ that helps people in this particular situation!