I think Biip has mentioned that due to all the sets that are already being offered and he's doing a high MOQ to try to keep prices down that the ergo set isn't happening.
Our best chance for Ergo compatibility I think is to get 2, 1.5U R1 keys added to the nomad set. then it would at least be possible with 2 base kits + a nomad kit to make a full ergo kit.
basically the same as MechMarket prices are for the set, plus you get a whole bunch of extra keys for as they get shiney