Easy mode: got it on turn 6
This may not be perfect, but here goes:
T1 buy scav
T2 buy workshop
T3 buy stash, workshop for scavenger (hand: scav, 3 copper, workshop, put deck in discard pile)
T4 buy stash (play scav, put deck)
T5 buy stash (play scav, put deck)
T6-13: buy province (hand: scav, 3 silvers and 1 copper, put deck)
Thanks for making the puzzle!