We actually tried.

We started off with mems on LN2 but quickly found that running CPU/13 would require CPU multi of x16 or lower, which would push BCLK too high for the CB.
So we stuck to CPU/14 and had couple of easy 19min1X passes at 3836, all of which crashed while saving the score.

This chip is a diva to bench.
It will run -130c under load at 3850 (or -120c at 3950), but has hard time idling below -100c, which makes idle/load transition hard to master.