As long as the PAC discloses up front that it is paying his legal fees, I don't have an issue with raising money for that.
I mean, if you buy the fact that this is politically motivated, and for the purpose of driving him out of the 2024 campaign, then helping to defend him on those cases is legitimate.
If the Democrats could force a candidate out of a race by making his legal defense unaffordable, they win. If it was a candidate I supported, and I thought that the prosecutions were politically motivated, I wouldn't have a problem contributing money to defend against them.