I've ridden thousands of hours at night using various 18650 powered flashlights, a couple generations of Magicshine headlights, and more recently a Gemini headlight, combined with a couple older generation Cateye wireless computers (when their only wireless computer was simply called Cordless), then a Strada wireless, and most recently the current model of Micro wireless:

CC-MC200W | CATEYE

I've never had a conflict between the lights and computers.

I suspect the OP's headlight is the source of trouble based on my limited experience of light+wireless computer combinations. I cannot offer a novel solution; move it far away (fork leg?) or simply replace it.