If you're going to play pukka Americana then you really do need to be playing a DB. That has surprisingly little to do with the sound and far more to do with the look.
The size difference is far less drastic than you might imagine. I have a 4/4 carved/ply DB, a 3/4 aluminium, and a Kolstein Busetto which is only a little larger than my old KK BabyBass. I play the Kolstein at really tight venues, natch, but that's more for ease of load-in/loud-out than because I haven't room for the 4/4. It's also because almost all of my DB gigs are doubling gigs, so for some of the gig I have to 'park' the DB somewhere while I play electric bass.
The feedback thing is all about learning how to control and avoid it. Extruded rubber f-hole blockers make an enormous difference, and equally important is NOT having your cab or combo right behind you and pointing straight at the DB. I played 60 feedback-free gigs on DB in 2022 at a very wide range of venues. I have a Crazy 8 cab on top of an old (spare) PA tripod pole, so my bass sound is aimed directly at my ears, not at the bass. Since I take a DI to the board at every gig, that works just fine.
Loud drummers can't be tamed, so best avoid them. 🙄