No more jangles: this brilliant hack from Pyro222 (inspired thusly here) custom fits all your keys into a compact Leatherman/multitool. The design even allows you to leave in a few tools and bits in the case for when the time arises.
Leatherman Micra - find an inexpensive copy at the hardware store
Keys - Make copies!
Something to cut the keys with, like a Dremel with a cutoff wheel.