Try AJ-12 or variants of it. There is also my SRAD (Single Run Ammonia Digest) emulsion here on APUG. It is a sticky post here, so it should be easy to find.

I have several in my book that fit your criteria.

But, you don't become an expert painter the first time you pick up a brush and apply it to canvas. This does take some practice. Having someone do it for you is going to be expensive on a one off basis. Probably on the order of over $500 or more for about 500g or less.