I assume you are talking about the bubble lenses. Can you just use the flat lens material from Trooperbay (instead of the bubble lens)?
https://trooperbay.com/dark-green-lens-material
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Basically I just placed a strip of blue painter's tape along the bottom edge of the snow trooper hand guards and trimmed along that line.
That's where I attached the snap that connects the belt to the abdomen plate (the square is already there). I painted the snap white and left the upper hole there. You can't quite make out the detail in my re-sub pics, but it looks just fine.
Here's my post after converting my FX kit to ESB:
http://www.whitearmor.net/forum/topic/22384-tk-209-esb-conversion-completed-for-re-activation/
The post has a link to my original set up as well.
I got a pair of Snowtrooper hand plates from a fellow member and trimmed them. Bought the ESB stickers (for FX bucket) and canvas belt from Trooperbay. Moved my holster to the right side (non-riveted). Repainted the ab buttons.
That's about it.