Gave basICColor a try, seems pretty good. Surprised at how much faster it was, while giving similar/better results (Though still added some slight color casts in the grayscale, is that just unavoidable? Not as much as Dispcalgui at least)
Here are my calibrated measurements:
HCFR grayscale/gamma:
HCFR RGB levels:
(Didn't show the primaries and secondaries, as they didn't seem to change from the un-calibrated results in HCFR)
basICColor validation: