Even if that worked, is it such a loss that we now have some personalization in our emojis? They aren't for super formal or technical needs. It's just something fun to express ourselves over text mediums.
Computers are powerful. We have no shortage of computer programmers. Given all the complexity in systems just to stay current and functional, a bit of extra work for emojis is a small price to pay.
If the day comes in which Unicode is dropped as a standard I can guarantee you, this kind of bloat will be part of the reason
If so then it probably won't be dropped, but forked in a mostly backward compatible way. (At least up to the point that variants got out of hand.)