The heavy trigger pull would be your only real problem.
I could care less about the cost of 9mm ammo, it is still reasonable. However, I dont see much point in bump firing since you cant aim well while doing it. The ten round limit on the mags makes it rather pointless as well, at least to me.
Give it a try, lets us know how it works out for you. I think the trigger is gonna prevent it from working worth a crap, but it will be interesting to see the results.