Welcome!
Genuine Topre TKL with backlighting as a stock board is nonexistent as far as I know. However, the Royal Kludge RC930-87 is a 55g (or 45g) Topre clone with RGB backlighting and Cherry compatible sliders. The board has been discontinued, though, so you'll have to try to find one in the aftermarket. It doesn't feel exactly like a 55g Topre, but you just may like it more.