I day dreamed up this idea recently which doesn't use tritium, but does use lithium-6. I did not realize how hard it is to get lithium-6, but if Castle Bravo is any indication, lithium-7 might work ok for my concept. Whether my concept has even a hope in hell of working is another story.
https://www.youtube.com/watch?v=xkzSCFLW5H4