I think I know what you want. Problem is, bery few horn players will have the specific skill you will need.

I have played horns for forty years, and stringed instruments for 25. I can hear a tune, and then very quickly play it on a guitar or banjo (chord sheets help a lot). But, to play a decent horn part, I need to have some music written out -- and tadpoles, not chords. There are some good (usually jazz) players who can play a decent part straight from their heads, but most non-written-out playing is not very good (mine included).

Maybe I am an anomaly, but I think not...

If you can supply the horn people with chord sheets, then send them away for a while to work out a part, then you may have something.