The entire ecosystem has moved towards BIP48 standard (m/48h/0h/0h/2h) for multisig except a few players, including Unchained. Unchained was built on a legacy system and hasn’t upgraded it in years. The second part of that sentence is also wrong. We no longer use m/48h/0h/0h anywhere in our system—been that way for several years. That being said, you can import non-standard multisig wallets like Unchained into Nunchuk or Sparrow, if you know what you’re doing. I believe they support the Coldcard multisig wallet config format. In that case you should export it as such. Bottom line is: multisig has been very well standardized by this point. Only a few projects still lag behind.