Just got the Tex Beetle in today...I'm enjoying it greatly. Getting replacement caps will definitely be a challenge. If you're after blanks then Justin offers blank caps for $15 + shipping from Taiwan.
It does have support for LEDs, the solder holes are filled just like the Poker 2.
The right shift key is surprisingly easy to adjust to..it's 1x size. I thought I'd struggle with it a lot, considering I had a rough time with a Pure that I eventually sold. But so far I haven't missed it once while touch typing.
Personally I won't be using the function layer for much of anything besides volume control, and the occasional F5. I am going to go take it apart now though! Pictures soon.