It looks like the 4 peripheral leds are mounted on a mvery custom mcpcb, with the center led being on a proprietary aluminum mcpcb. I doubt you’ll be able to find an aftermarket one with an led mounted, so reflowing the uv emitter on it is your best option.

These are 3030 size leds, so any xp-l uv emitter will work in their place. You might want to check the current requirements for the uv emitters before tackling this since a driver swap might be needed to drive everything properly.

Reflowing is not difficult. You need solder paste, a way to apply indirect heat to the mcpcb and fine tweezers.