Since you don't want a pond full of bass or have to harvest bass, I would leave them out. Maybe consider WE, HSB and perhaps YP as forage? I'm not a pro, just thinking of fish that will not reproduce and over populate. The YP will reproduce but the trout, WE and HSB should be able to control their numbers.
+1 on that. With YP and walleye the WE won't reproduce and all you will have to do is eat a few perch dinners every year.
