Tritium would not work even if it was non radioactive (personally I do not think the radiation is an issue, it is the lack of light radiation that is a problem.
In a pitch black closet you can barely see it thru the skin when folded like in the picture and it is even worse between the thumb webbing, so unless you want to take your friends into a dark room to show it off, it would just be a useless little bump. This is a pretty beefy and fresh vial too.
It is almost known for being underwhelming even on the surface of wristwatches
Quite interested in LED though.