[Speedslug]

You might have to actually do the work yourself.

Start with getting a "consult" from a professional. That way they are have no liability, they are just offering you an opinion on what you plan to do.

Then get all the parts to do what you have planned and get another "consult" from a professional.

Then do the installation yourself and lastly have it inspected by a professional or the local code inspector or a fire marshal.

The work itself is not hard to do or to understand.

I don't know how the laws work where you live but where I am they have this "King of the castle" thing in the local laws that says the government can't tell me what I can and can not do in my own home if I have title to the place ( or a mortgage on it).
We can be held liable if something goes wrong that winds up causing problems for others and we have to follow what ever deals we make with the bank that holds the mortgage.