If 1 single mode is what you want, I would suggest to get a light like the BLF A6 or a Convoy 2+ (biscotti Firmaware, 8*7135 chips), and configure them with the option of 1 mode (BLF A6) only or the 100% level (Convoy S2+).
At least in the Convoys with rubber tailcap you can use forward Clicky Switches that allow you to use in momentary or continuous ON.
Also, if you can solder, you can try to mod these lights and make them “triples” (3 Leds + Carclo Optics) with the drivers they already have.
Cheap and effective, in my opinion!
What kind of output are you expecting from the light you want, if I may ask?