They’re billionaires, they can launder that money in their sleep. Really all they have to do is take 10 million of their money out of the bank to start the trust and use the cash from Hank as pocket money until it runs out. With their bank balance nobody will notice them getting a bit less cash out of the bank for a year or so, it’s a non-material sum for them.
More likely, Jesse’s stoner friends will be scooped up by the DEA, as they question all know associates and accomplices, and it won’t take them but two seconds to spill the beans.