Wonder if iron blocks would benefit?
Pretty much need to come up with some kind of vessel or cooler. We vent of liquid all the time. Just need to make something easily taken apart, and hook up a 1/2" line and valve, then on the other end hook up a vent/purge or outlet line... Basically just crack the inlet and leave the outlet all the way open. How much the inlet is cracked will result temp drop or cool down period/rate. Once you see liquid coming out the outlet you know the inside is as cold as the liquid.. Just close the outlet at this point.
The vessel would need to be made of stainless or aluminum to keep from cold imbrittelment.
Maybe I should start doing this, and maybe offer to do this for fellow racers for a small fee..
If they would be a interest.... Small parts, like cams, and lifters with very little setup... But for blocks and cranks I would need a vessel.

chyro was .developed for machine cutting bits
during the world war..turning bullet and shell casings in a mass production..chryo treated lasted measurably longer..
in the 90s i raced and worked on professional roadrace motorcycles..we had a all kinds of stuff chryo treated..gearboxes cranks valves cams..
even the aluminum frames
but things like cyl walls that have to be machined afterwards created some problems...
the cutting speed truning cranks and boring ect. had to be adjusted...because its alot harder to machine a chryo part..
also you have to re-clearence after chryo treating.the dimensions of the part can change afterwards..fwiw.
it works there is no doubt about it.

the way i understand it the freezing slows down the molecules and allows them to align into a more uniform structure which is where the strength comes from

That's funny!

Just had mine done by Liberty.