My Leef bodied HA 6p is only a few days away. It can be done, but you're still playing the color match loto and it depends on parts availability. My last Leef body wasn't even close to being a color match, but I have the lego I wanted so I'll worry about the color match later.
Regarding parts hunting on b/s/t, I work 60-90 hrs/ week and I'm in the single dad league, with 4 kids ages 1-12, so I can't spend much time looking for parts.
In reference to a HA 6p cutting into the C and M series, I disagree! You can buy a C2 in either finish with an $11 up-charge for HA. The C2 and M2 are purpose built lights that perform a specific function well. However, for general duty use and belt carry, the 6p is much more functional and in my opinion, a HA finish would make it more so.