A wireless remote switch?

[Phlogiston]

I remember loneoceans did a FET tailswitch board, if that helps:

GFS16 - Battery Indicator Tailcap Light & 1mR FET Tailswitch! (Rev B)

Hello BLF, TL;DR: I built a tailswitch system comprised of two PCBs, called the GFS16 System. First is a 18mm Taillight board which provides the regular taillight, and also features a battery sensing system to change the LEDs colours when the battery voltage is low (Rev B features 5uA standby current!). Second is a 16mm Tailspring/FET board, which allows replacement of the switch for a super low resistance FET, allow for the best performance in high current flashlights. All PCBs are up on OSHP…

You could wire your remote switch to operate the FET and let the FET handle the heavy load.