Tooltech as been doing this for a long time. And they are still doing it. http://tooltechgunsight.com/
I have an old Washington State Patrol 92. Tooltech had the ability, 30 or 40 years ago, to turn non-tritium sights into actual tritium glowing sights. This includes the machined-in front sights of the M92. I know they did this for WSP because I used to know the dealer who had that contract with WSP. Naturally those are now deader than Elvis. They are not even tiny white dots.
And just so I belong here, I consider my Landon Carry Compact as one of the "never sell" guns.
And I'm so old I remember the WSP carrying S&W 6-inch Highway Patrol .357 Magnums, carried cross-draw. But that puts me into another sub-forum.
Bart Noir
“I was handy with a rifle, my father’s .303. I fought for something final, not the right to disagree.” -Leonard Cohen.