Looks awesome. Might give this a spin. I see you support Blockstrean Jade's? That's neat.
Most USB and all QR hardware signers should work.
Ledger?
Should work.
Great. Thanks! Does multi-sig normally require support on the hardware wallet itself?
All good hardware wallets recognize multisig and then do additional checks to ensure the change output goes back to the same multisig wallet. Hardware wallets can ignore this however and sign anyway, but this is not recommended.