My issue isn’t with actually using multisig for transactions, but just being able to monitor the balance in a different software application than the primary wallet software.
Discussion
Yes.
You can watch only in both specter and blue wallet.
Blue wallet being the easier of the two.
So the software I was trying to is my budgeting software Copilot. They support either a single Bitcoin address or xpub. I guess with multisig since it’s a combination of xpubs or a BSMS file I won’t be able to add a multisig wallet there.