yes possible by adjustment of the eye ends at the flap and at the flap bellcrank ends
Its been a while for me but............ not legal I think . Definately for the 150/152 and I think also for the 172,182,etc, to correct a wing heavy condition the wing root trailing edge is adjusted up or down via an eccentric bush at the rear spar attachment bolt ! The flaps must stay rigged neutral .
VK