My honest guidance to you Duncan is to suggest that using arguments such as the 2nd law of thermodynamics, simply tells me you really do not understand the 2nd law of thermodynamics at all.
It's a very old argument that has been very robustly debunked. Your best move is to read up on it.
To help you out, here below is a link to a paper in Nature from over a decade ago (2010). It directly addresses it all and is titled "Evolution and the Second Law of Thermodynamics: Effectively Communicating to Non-technicians"
https://evolution-outreach.biomedcentral.com/articles/10.1007/s12052-009-0195-3
I sincerely hope this helps.