Well I`m not sure if its too naive. But you may probably wanna try to make your 2-3-1-3-1 (wb) into 3-3-3-1 (wob):
Defenders - as you`ve suggested drag the DMC (wb) down into middle DC position
Midfielders - pull your two side DMCs (wb) into the flanks, that is, DML/DMR (wob), and pas you said drag MC (wb) back to DMC (wob) for defensive purposes, hold on ball maybe? Finally pull 2 or even 3 of your AMC (wb) back. If your original middle AMC can also play F (robben etc) then I`d be tempted to put 2xF wob
Forward - zone marking maybe?