What is your elevation in the mountains?
I am not a "cold water fish" guy, but do fish up in Canada at my uncle's cabin (whenever I can get there).
Their lake is several hundred miles north of you. The shallow bays will freeze 5' deep of ice during cold winters. A surprising (to me) diversity of fish species survive those tough conditions.
If you don't prefer trout, then I (non-expert) think you can make a go of it with other fish. A SMB and yellow perch pond would be an option. If your pond is too cold for red-ear sunfish then you can probably use pumpkinseeds as your forage panfish. However, if you want to use an automatic pellet feeder, then I think you could have an excellent pond with only SMB and YP.
If you catch walleye nearby, you could even "bucket stock" a few, and have that as a bonus fish.
P.S. I just re-read your post, and see that you have already stocked BG. If the BG do thrive in your pond, then you will probably need LMB to keep their numbers in check.
All of my advice above is strictly amateur advice. Hopefully some of our pond-stocking experts or members that manage northern ponds will actually drop into your thread with some expert advice.
