Well first off that's not a retcon so much as a de-retcon. Max having just the two legs (and a presumably prehensile nose and possibly ears too?) was always Phil Tippett's intention with the design; it's just how they executed it with the puppet didn't convey it clearly once a person got in side and started operating it. The Kenner people who had to go off of production stills, quite understandably interpreted the design incorrectly when making the toy, and it just kinda stuck.
But yes, from what I've seen the Ortolan kid in 'Skeleton Crew' is indeed of the 4-limbed Kenner style. Personally I don't see any problem or contradiction with it. The Kenner version is just as much a part of Star Wars as the original Tippet configuration, and it doesn't take a huge amount of imagination to reconcile the two.
For example: perhaps there are two sub-species of Orolans; the more common four limbed caste from Orto's extensive glacial polar regions, and the much rarer two-limbed tree-climbers & waders of the equatorial bayoos?
Or, perhaps it's something to do with an Orolan's life-cycle? Maybe they loose their "baby legs" as they mature?
That was my assumption.
While I don't recall any specific Miraluka characters using cybernetics like that in any of the old EU material; but then most of those were Jedi and thus wouldn't need them. There were however numerous mask options for Miraluka in the SWTOR character creator that had a certain cybernetic look to them, and honestly that's probably where one would find the largest pool of Miraluka characters in any image search.
It makes sense honestly for a breed of humans* born eyeless to use cybernetics to get around, especially away from their homeworld; if for no other reason than being able to use even simple displays and computer controls.
*I've always disliked the term "near human", as it has a condescending tone that doesn't fit IMO outside of the Imperial Era, so I just prefer to think of such more as human cousins, and descendents of ancient strand-cast lines.
