The problem is that there is no in-between... an individual who is work-impacted by COVID-19 either a) files for UI/UE and gets standard $ + enhanced federal $ or b) does not. There's really no option for people to go "well, I actually make $100 less than standard $ + federal $ so please remove $100 from my benefit amount" short of them not applying at all.
The only way to fix this for the future is to spend god-awful amounts of money to upgrade these systems away from COBOL, or spend god-awful amounts of money to hire more state salaried/benefitted workers to manually process claims.
Since these are state systems, fat chance of that happening. This is actually the least intrusive option monetarily, since the federal gov't can just literally print money and states cannot. That's another can of worms for another thread (heck, another forum).