BAC is handing System Blue, which is now made offshore. Yamaha of course is probably the biggest footprint. Kanstul's offshore Tama line was a thing, dunno what became of that. And there are a smattering of lines running Andalucia horns which are also offshore production.
Tony Scodwell is also launching a new flugel, of course as Kanstul has shut. No word yet on who is doing the production. Seems like everything is either offshore or BAC, and I worry if BAC tries to fill every void. Maybe they can.
I have heard Andalucia lines - the depth of sound knocks you back on your heels. They were a mix of Carol & Kanstul for a time. I assume they have reverted to all Carol then (?)
BAC has been fairly clear about not trying to be everything Kanstul did - it was a bad strategy for Kanstul, and they can see that careful targeted products are a much more prudent course of action.
Certain AMI instruments were made onshore by Kanstul. He had a bell front (marching) alto horn in F that was made after the Kanstul G Alto bugle, for instance.
I have one of his Phase III trumpets, the K20 bell. Loud. Big. Full. But you have to put two layers of foam on your mutes, the bell was only a smidge smaller than a Kanstul 1525 flugel.
I don't know whether they are made by Carol per se, or "one of Carol's suppliers".