Yes it can be done...and has been done...and your finger lakes training will help you out. I have a friend...who used ot post on this board in the fingerakes section..."BigGuy'....he's jigged up some kings this time of year in open water.
Most good jig fishermen are using "Flasher" units ...so they can locate fish...and on the flasher you can see the fish and your jig...and actually watch the fish move to the jig. A couple years ago Toby hung three or four kings in ther high teens to low 20's...using this method.
Simply located some big hooks in open water...Off Sandy BTW out about 150 foot of water and had at em. Using flukes, or soft plastics.
Back in the 80's we've jigged for lakers off sandy...caught one down about 250 foot once....4 ounce jig used in Flaming Gorge Utah. I tell ya...if the fishermen ever gave jigging a chance...and worked at it...and you felt those fish grab a bait...trolling would not be the method of choice to catch these fish.
Now you are 1v1 with the fish start to finish.