v2.5.2 is out.
Now you can attach external wallets by providing their BIP39 recovery phrases.
Here's a screenshot which shows an example where a single SBW app contains 4 types of wallets including an attached one.
SBW
npub1chxa...rjdd
An OG Simple Bitcoin Wallet, it's been through a lot but it's still rolling and the best is yet to come. Proudly made in Ukraine.