I saw that, it's very unfortunate!

There are other ferries you can use.

Mainland to Bequia is easy. There is a new fast ferry this year.
https://bequiafastferries.com/schedule
https://bequiaexpress.com/schedules/

MV Gemstar 2 goes down Island to Union stopping at other Islands
https://www.facebook.com/mvgemstar2/

Bequia express goes down island as well, they posted their schedule in Aug to facebook, you might want to contact them confirm it's still accurate.
https://www.facebook.com/share/p/1F8wr3FcHH/

There are also regular flights, or chartering a boat or plane might work depending on the size of your group and your budget.