I wondered if he knew how closely his color matched the yellowing pea leaves (hmm, I recall wondering about colors before).
After crawling around in a very determined manner, he suddenly did a few moves and positioned himself under two leaves (large picture below).
Still no munching, so I supposed he was just looking for a nice place to tuck in after we disrupted his sleep!
The last part of the pea vines are still in place and this evening he was tucked in on another stem. I think he is a yellow bear caterpillar that will turn into a moth. I hope no one is going to tell me I'll be sorry for letting him stay.