I believe it could easily be solved with two coins, ADA and ADA-CASH. ADA floats freely and is used for savings (store of value) while ADA-CASH is pegged to the US dollar and used for daily transactions. Daedalus should be able to easily store both and change from one to another with ease, perhaps with a built in exchange? ADA is fixed in supply while ADA-CASH can grow on demand by adding one zero to all wallets at once so there won’t be first receivers who have an advantage over the rest (FED/GOVT).
I hope somebody tries to implement this solution soon and I would like to be part of it.