By popular demand I've created HTC Kaiser CustomRUU, it is basically the same as the HTC RUU, but packed in one single exe file and slightly patched to perform a 'task 32' instead of a 'task 28' after flashing an NBH, so it will not format your device if you just flash a radio or a Splash screen.
Note: This CustomRUU will not allow you to flash unsigned files unless you have HardSPL
installed, it will not push SSPL.
as always: Drop the NBH file of your choice in the same folder as CustomRUU and start flashing
Recommended tools for handling NBH files: