Great discussion!
I retip beryllium all the time. Most common retip for me is the Micro Acoustics MA 2002e. Utterly fantastic cartridge. I’m a bit obsessed with them. Original diamond was a round shank .2 x .7 mil elliptical. I have square shank .2 x .7 mil elliptical that will fit inside the round shank. I can also surface mount diamonds to it when necessary, say if you want a low profile half height Fritz Gyger FG 2 on it because I can’t get a full size one to fit in the original hole. I can’t drill beryllium because its dust is highly toxic.
https://www.instagram.com/p/DCcAqKVO9pr/?igsh=enJ2OGcyamgzNGw2
Other brands of cartridge that used beryllium back in the day that so I have retipped are Audio-Technica and Yamaha. I really can’t think of other manufacturers that used beryllium except for maybe some very early Dynavector.
I also retip sapphire and ruby and hollow sapphire and hollow ruby, though the hollow ones are very very rare.