LED drivers and Accessories you want, but don’t exist

Now this is something more powerful:

This is a 1-Mode boost converter with an MP3431 on a 17mm board, powered with 1×18650 or something similar (max. input current 19A!). Current is set with one resistor, like the 1-Mode buck-boost circuit before (of course you can change the current sense resistor as well).
If it doesn’t get too hot, this circuit could supply (calculated values) up to 6-7A to an XHP50/50.2/70 (the lower the forward voltage of the LED the better), or a bit over 3A to an XHP35.
Heat probably will be a problem, but for short bursts, it should work.