His lawyers should demand payment up-front in gold coins.
One of them did.
https://www.wsj.com/articles/new-trump-attorney-negotiated-a-3-million-advance-payment-for-work-11663264788
It’s behind a paywall, but you can see right below the headline “ Chris Kise sought the arrangement based on unprecedented investigation, Trump’s reputation for not paying legal fees”
But not in gold coins….