There are no really good quality, low profile backlit (translucent) caps, except perhaps for the ones on the new Leopold boards.
If you're in such a dark environment you need backlighting to see the legends, you should turn some lights on anyway. It's not good to have a bright screen and dark everywhere else, the high contrast is bad for your eyes.
So, if you give up the need for backlighting, there are lots of keycap sets to choose from. The lowest profile that is still "sculptured" (different height and angle across rows) is Cherry profile. GMK keycaps are Cherry profile. Signature Plastics DCS profile is quite similar, but the bottom two rows are more steeply angled. DSA profile is also low, but it is not "sculptured" and has spherical tops instead of cylindrical.
In general, mechanical keyboards are taller than most rubber dome boards and this can be a problem in the beginning, until you realise that for normal typing you should not have any part of your hand touching the desk. For gaming I recommend getting a piece of wood or similar material that you can rest the hard "heel" of your palm on so your wrist stays straight while playing since it's hard to keep it raised for long periods without support. If you do this, you won't need to change keycaps.
