Based on your process I agree the best solution would be finings. Added once the beer is cold and left for a 3-day cold rest you should be racking very clear beer over. No need to lager 6 weeks after that treatment either. 1-2 weeks is usually enough.
Anyway, I think your plan is sound. Keep up with the sanitation on the filter, since that will probably be the weak link. 5 micron nominal won't get all your yeast for powdery strains, so don't expect it to be a silver bullet.