Oh bother I had not heard of that moth and have not noticed it here. We just find the odd green caterpillar on pea leaves.
It sounds like mesh is best option, also bacillus thuringiensis, see my Pest video for more on that.
It’s late to sow peas for shoots but you will get some, just a lot less than from spring sowing, maybe try a few to see: they grow best in cool, damp summers and it’s going the other way I think this year.
