That is TRICK! I may have to do that if I think my i1 Display pro ever starts to drift (no idea if I can or not, as it is enclosed).
They did this awhile ago (maybe still do) with a ColorMunki Spectro. I think it is $99 at the time, but you had to put a deposit of I think $600 down.
Which I actually ended up doing. It was a flawless transaction. Profiled it against my i1d2 (which showed how horrible it was out of spec, and the meter was only 6 months old). VERY VERY smooth transaction.