Yes- I put one of those high power, multi-beam cree lights specifically made as a commuter bicycle headlight into a 1950s-60s era Miller shell. I soldered the LED to a basic 2-position toggle switch, then I modified the dish to take the guts of the cree light and used epoxy to secure the light into the dish. I then removed the generator terminal on the shell and put the toggle into the hole where the generator terminal was. I also opened a hole on the floor of the shell to hold the head for the recharger cable leading into the cree.
Output is 3 beams with about 1,400 lumens on high. Battery pack velcro straps to the stem. When not in use, the battery pack can be removed and put in the saddle bag. You get three beam choices plus an hazard flasher. It is very, very bright on high.
https://bikeshedva.blogspot.com/2014/06/retro-bicycle-led-headlight-construction.html