Many yrs ago, I watched an episode of Butch Furtman out of Duluth, and he was jigging lakers on superior with a fly reel on his rod. I thought that if Butch was doing it, it was probably worth a try. I fish Ontario waters a lot, so my fishing is a helluva lot shallower than what BF was fishing on Lake Superior. All I can say is that a fly reel for lake trout fishing is about on par with an old school wrap up stick with the spike on the end of it. Maybe it would be different for you, but for this guy, it was useless.
Having to strip line out by hand to get the jig down and then having the SLOW retrieval made playing the up-and-down game to get lakers to commit a real chore. Get a decent reel, lube it with hot sauce, and go catch some fish. Leave the fly reel for flatlining some summer fish.
Just my $0.02. T