If we go into hyperinflation...
We won't.
only the wealthiest will manage unscathed.
Wrong.
The super-wealthy will be better off, but certainly wouldn't be "unscathed." Much of their assets are in stocks, bonds and real estate, all of which would be difficult to move and heavily devalued in a hyperinflation.
If they try to sell those assets so they can move them abroad, they'll get hit with taxes. The value would drop because many people would likely try to sell all at once. They'd have to find some safe assets abroad, which will drive up the price of those assets. The companies they own, or run, or own stock in, will all need to pay their workers more (or else those workers will all need to quit).
Oh, and if they want to continue to live in the US, they will burn through their cash quickly. That could be compounded by difficulties with currency exchanges.
I'd add that if the US really did have a hyperinflation, foreign assets will also get screwed by the resulting global recession.
If anything, the only ones who could really survive "unscathed" (or with minimal damage) are those who are already heavily invested abroad; or those who have moderate amounts of assets that they can quickly move abroad.
I might add, this is a HUGE reason why you will never see hyperinflation in the US. Wealthy people know that their assets and influence will be devastated, so they will do anything they can to prevent it from happening. And given that they shovel money at both parties, they're almost certainly going to get their way on this one.
We cannot afford more hardship.
Well, we could, but we don't want to. I'd say that in many ways, the Great Depression followed by WWII was much worse than COVID, and it was awful, but the US certainly survived. At any rate, the only way to avoid "more hardship" is with stimulus packages and keeping interest rates low.
I think even Keynes would be alarmed.
That seems highly unlikely. What would have alarmed him is something like cutting spending while starting two wars (Bush 43) or driving up the debt while cutting taxes for the wealthy and corporations (Trump).
Let's be very clear about this:
austerity in a downturn absolutely does not work. That was made screamingly obvious by the reaction to the 2008 recession.