people been trying for years to make LED illuminated tee moulding and its execution has never been real great.
always have hot spots from the leds and fitment issues
about the best you can do is EL wire under transparent moulding, but EL has always been hit or miss and often degrades...
look into "LED neon strip" and see if you can find something you could make work... it would likely require removing a fair bit of material, but look not too bad if you think it would integrate and you had the right area to put it.