the venerable Convoy S2+ is a good choice. Just add 17mm driver, and 16mm MPCB with your choice of LED. I might suggest the XPL-hi, it throws nicely and plays well with the MtnElectronics Product Code: FET17-NUV

Toss on a flat top or button top 18650 and you’re up and running in 15 minutes.
Then you can add the LED light-up tailcap