I'd say it is fairly implausible.
It's from an era where proper lume was a selling point, not an attribute you'd wish to dampen, IMO. In general, when lumed hands are paired with unlumed hands, caution is due. I cannot think of a watch where that particular combination is par for the course, but I'd love to see one.
There has been a few fifties Omegas shown on this site with that irregular pairing, but my guess would be that it is either a special order (as versions with lume wasn't available) or a post-purchase modification. We'll most likely never know
Btw, I asked about the Midos in your post as I had only earlier today seen them on IG
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