At home flywheel balance....

Well, to figure that out, on would have to figure up the range of weight moments, and compare that to the moment required to overcome stiction in this setup. I am not totally clear on the process to be used for balancing this, but would you remove some metal on the wheel and see if it balanced against a known weight on the opposite side?

I looked quickly to see if I could find some stiction numbers for a similar bearing but was not successful. Besides, it will vary with the side load on the bearing. Probably the best way for you is to test it directly on your setup. With the flywheel unmodified (neutral balanced), I would gently hang some very small weight from a light string at the outer periphery (so it is hanging straight down at + or - 90 degree point on the wheel) and see if it moved the wheel. Then keep increasing the weight 'til it could move the wheel. The hang it from the other side and repeat. You my then even want to move the wheel 90 degrees and repeat the measurements again. I would use a powder loading scale since they are made to go down to very small fractions of grams with accuracy. (And weigh the string too!)

Take the average of those weights and the distance from the center to the periphery and multiply and that will be your average stiction moment and that will be your margin of error.

BTW, on thing you are fighting here is the heavy weight of the wheel, which makes the stiction even higher, since stiction/friction generally increases in proportional to weight loading.