Portage Salarial

Hi All,
I wonder if anyone can suggest a helpful/good French portage company for a person who is a manual worker (working in private jet outfitting/Formula 1 bodywork)?

I thought I had found one, but then it turns out they are only for 'intellectual' contractors, as insurance is trickier for my husband.

He always works outside France (Austria/Switzerland) and was with a British portage company last year, but this seems to make no sense, as he hasn't lived in Britain since 2004.