They should actually let him. Let him have what he wants, and publicly pin it to him too, good and hard.
Tens (or is it hundreds) of thousands of IRS employees hitting the breadline, plus the immediate and complete collapse of the government due to lack of treasury, should be absolutely seen and (better) felt by the MAGA faithful. When all the other handouts they rely on dry up, and the military runs out of MRE's and pay, and necessary infrastructure stops being built or repaired, all due to lack of tax funding, perhaps they might start to get the concepts of a clue.
They could also ask Musk to dip into his billions to help them out. After all, his bitcoin-based fortune is all solid gold in the bank he can get at any time. Isn't it!