So what offense should they run is the question? You suggested 2 back with a lead blocker. Cool, but are you going to block the correct person and push the pile?!? Should we go back to the TO and have non TO coaches call a TO game? Good luck with that.
Story time:
I transitioned in 2008 from an aggressive zone blitz Tenuta scheme to a read n react Cov 4 based Wommack scheme. The coaching staff thought it would be good idea to keep half of Tenuta blitzes to merge Wommack scheme. What happened miscommunication galore. Ex. Tenuta blitzes were designated with bird names that began with the blitzer who going. So let’s use Wren which is WLB blitz. Under Wommack, he thought it was bright to change the names of the linebackers. So the SLB became the Wolf & the WLB became the Stinger. So imagine the thinking that went on when those blitzes were called. Also, when you are calling a game with something you are not comfortable with, when do you call that Tenuta blitz vs. your particular scheme?
Changing schemes creates doubt and will have you losing players quicker than most realize.