Just a thought. 5 or 6 rivets that are "fixed" with blinds would not cause that big of a leak. That amount of water reminds me of when I had a rivet completely missing and it filled my boat to the floorboards in less than 2 hours.
I say "fixed" because you already know the blinds are a temporary fix. I did the same thing and started with 5 or 6. Then as I checked the hull I found more and more. Had over 40 by the end of a summer. Problem is solid rivets are structural, and blind rivets are not. I was just breaking all the weak, damaged rivets along a few seams but the leaking was manageable with blinds/sealant. Last run of the season before I ripped the floors up to fix it right, I ran her especially hard through some chop to give the rest of the rivets a test, and broke a bunch more.
Point Im making is take it easy on her until you're ready to remove the floors. Seems daunting at first but it's really not that bad to have to do. Other point is the leak is probably from the thru hole or seams vs rivets. But Id be checking for new broken or loose rivets after every trip.
