It is -almost- unheard of for a female to die due to being egg bound. They usually release the eggs or reabsorb them. Though an egg filled female will look very fat, usually it's not problem. If you end up with a breeding situation I would kill the eggs however.
The way you keep your fish is up to you. Everyone here including myself has given you fair warning. Clearly this set up is working for you. You may or may not end up "learning the hard way." Sometimes people are lucky with docile fish. Just remember that the next betta you buy will probably not be as friendly as these guys. And I'm sure you understand the risks you are taking by doing this, and again that's your own choice. If anything happened to any of the fish I highly doubt anyone on this forum would say "I told you so" and rub it in. We are very accepting people, many of us trying to point you in the right direction is all. I really hope you are not feeling harassed by any of us at the moment.
I wish you and your fish more future success.