Hi.
Good to hear that You're thinking about other options too.
But let's think about this in another way, since it's not just amp/rig related, but about all the MI related purchases.
The amp You have ATM is blown. You can't use it for anything else than home practise?
Until You have an amp which you can rehearse with as a whole band, you guys won't be ready for gigging.
Wouldn't it be better to buy a rig (doing Your homework obviously beforehand) than be saving up for something...or the other, for ages. And that rig won't satisfy You endlessly no less (GAS will get You

).
All that saving time You won't be able to rehearse or gig, unless you can borrow someone elses rig for both.
The bottom line for me has always been that it's better to play with crap than not play at all. Within reason of course.
$400CAN isn't the biggest pile of money I know, but it's hell of a lot more than what I had when I started out a few decades ago

.
Yet another thought.
While You're at L&M ask for a dirt cheap (used) bass speaker to replace the blown one in the B-combo you have. Preferably one that has at least some T/S specs to help with the tuning calculations. I certainly won't advice to pump a ****load of money to that combo, but a working amp is always worth something, to someone.
Regards
Sam