This question got asked in the U.K. forum “where to buy a mask” thread. I wasn’t completely joking with my response.
I find I become particularly conscious of where my hands go after I’ve been preparing chillies. I’ll bet you do too!
If you handle cut chillies enough you could probably play the “chilli hands” mind game where you pretend to yourself you just touched some and adjust your habits accordingly.
If you’d rather have a different stimulus to pain for this kind of aversion therapy, you could smear a smell you hate on your hands - for me that would be geranium and you can buy that stench distilled into an oil. Am not too fond of rosemary either, or cloves.