True, although in this case there's a lot of pushback - if it's not during the summer, can students get both credit and paid? How hard is it to make your lab jobs work-study positions, given they are all one-off positions? And there would definitely be pushback on it being mandatory, because academics, as much as I hate that we do, tend to love free labor.
Devoting energy to those fights, and the political capital consequences of doing so, and success if you were successful, would be an excellent addition to a DEI statement, and would help explain why you were less productive than J. OtherProfessor, who chose to devote their time strictly to research.
The best DEI statements are ones that discuss action.
The above would be one real solution to increase diversity (while not necessarily being cheap/free), with the benefit of also one not likely to be opposed from either side of the political spectrum (a true rarity these days).