Are you trying to tell us to store our funds(Bitcoins) on exchanges? Because that's the only way I know you can convert Bitcoin to usdt. Except you want to use multi coin wallets like trust which I still see as unsafe and not reliable. Yes the transaction fees is a very terrible thing at the moment but we shouldn't let a short time issue create for us a long time wound( something we will remember for ever).
Don't store your Bitcoins on exchanges. If at all, not all of them. You can just keep a small amount of funds there just Incase of emergency especially in times when fees are very high. Its a method that might save you fees but you may end up losing your funds through such method.
Perfectly said, what the op said may sounds good but it's very risky and I will rather pay the high fee than getting myself into a very big mess or losing my money though the high fee is not encouraging but we should manage till it's time is over just as Hatchy said, it's a short time problem. However, anyone who feel or think he/she can afford to take the risk should go ahead but my advise is that, they should be careful cause since it requires some corner corner process one will definitely make a mistake one day, not wishing anyone to fall victim though.