RE: Warbirds "trainer"
LOL you nailed Mr Stang,my second plane a Gizmo kit I built, alot like a high wing Sig Something extra,it was a great start and really is much more manueverable than either of my H-9 warbirds.
I would think as long as you have some solid instructional guidence,at least flying on a buddy box for a bit to get used to the more sensitive plane, then any of the Hangar-9 warbirds would be ok they are pretty easy to fly, but do have some quirks that for the inexpierenced can get you into trouble fast,there point and shoot planes and not self correcting like a trainer would be.
on the other hand there's some planes with symetrical strait wings that some consider second planes, that are alot looser than the H-9's when on high control rates.
my first warbird was a H-9P-40,I had alot of help with trimming it and with the maiden flight, after that I haven't looked back, but it was at least 2 years of flying and sim training before that,having pretty much mastered the trainer on take off and landing as well as the Gizmo.
being a warbird fan I would say you wouldn't go wrong with a H-9