You can create transactions with external tools, there is PSBT signing support in wallet-tool.py.
btw nostr:npub1vadcfln4ugt2h9ruwsuwu5vu5am4xaka7pw6m7axy79aqyhp6u5q9knuu7 nostr:npub1vxpwwydpmmc4usmxf2zkr8shdjq888g532ydyls3nadxxd9wyx5ssjq5nd is it possible and safe to share and manage the JoinMarket wallet with external tools?
Discussion
Thanks. Thinking about it some more, the main use case can be solved with just receiving — so exporting the xpub to integrate it as a watch-only wallet in BTCPay works fine. More here nostr:nevent1qqszwf5n54lxlf73j9qu9crg7mh84gpzpy8y9unjarc4rl4a4t7lkqcfcxhd4