Standardize Pre-colored Eyes with Eye color MTX

Over the years helm MTX with pre-colored eyes have been set in stone and there have been very few exceptions. I'd like to preset the concept of allowing all helms with pre-colored eyes to accept other eye color support to increase versatility for style of each piece.

This may also improve sales on Eye MTX and Armors with pre-colored eyes.

Example here though obviously I didn't go all out with the thematic changes; it's not hard to imagine how this small change can lead to more interesting mixes and opportunities.