OP I think you're catastrophising a bit here here.
I'm also in Ireland and a lot of what you are saying is just incorrect. There's no agreed redress scheme that says you have to find 10% and the prices are set at build prices, there's no officially signed off redress scheme in place yet, its all part of negotation and the government has committed to 100% in principal.
The local groups in Donegal of affected residents aren't happy with some of the details that have leaked, but to be fair, some of their demands seem quite unreasonable. They're basically saying all houses have to be rebuilt as they were, we're talking 2500 square foot huge luxury houses, all fittings etc etc, and holiday homes, as well as more 'normal' family homes. There has been no mention I've heard of of using the amounts it cost to build 15 years ago.
Most people feel huge sympathy for the affected families, and you're obviously in a terrible situation, but I'd be shocked if a sensible solution and compromise isn't reached. I'll be honest and say personally, it does seem a bit mad the government is expected to pay a 4 billion redress bill to cover houses including houses bought after these defects were known about, and its just accepted the quarries and builders involved get off Scott free. There are lots of situations I can think of, where, for example, apartment tenants have had to pay out to upgrade fire safety and there's been no government contribution, never mind 100%. It seems there's a compromise to be worked out somewhere in between.
Its nonetheless appallingly stressful. How bad are the defects in your house now? Is it currently not inhabitable or are you worried about the progressive damage? It is very likely a full redress scheme will be decided in the next month or so. It sounds ike you've gone down a rabbit hole of reading the worst case fears people have for what will be in the redress scheme, I think if you can wait a bit longer till you see what emerges it might not be that bad at all.