Has "⿰面了" been suggested as a analogical simplification of 䩍?
Yes, but actually no.

Yes, because the 2.9.008 rule of the second part of the Second Stage simplifications (1977-1978) postulated simplifying 尞 to 了 wherever it occurs: 撩, 瞭, 缭, etc.

No, because all the simplification schemes are explicitly referring to popularly used characters only, and the practice was and remains to avoid overindulging in simplifications: texts where such characters can occur are probably about the character itself, and thus its original form is preferred. 䩍 (U+4A4D) is not even remotely a popular character, with its only claim of fame being the appearance in the Kāngxī Dictionary.

By the way, note that in the actual Second Stage, were it implemented, 面 is simplified into  (U+2BA51) as well (rule 1.2.009). So, ⿰了 is the actual IDS you are looking for, looking like this (http://glyphwiki.org/wiki/u2ff0-u2ba51-u4e86, just drew it):