If you wanted to add in multi vendor security,
Id just buy a Foundation or Jade along with it or build a Specter DiY.
Anything that can handle QR PSBT & SeedQR.
Foundation should be adding SeedQR in it's next release 🤞.
SeedSigner only multisig > SingleSig w PP
Two vendor Multisig > over complicated setups
Just my 1nak.