OK. Actually I believe that also for all the languages that I listed (except English), the use of the English + Spanish + Portuguese + Catalan layout would be limited mainly to ad-hoc needs: it is good to be able to write also the listed languages on the primarily English keyboard. I also believe that also a genuine Spanish + Portuguese + Catalan TOHKBD will be needed. In my previous comments I've written something about them, and will later suggest a new layout for them. Just now I'm too busy with my other activities and hobbies.
Anyway, your layout will be good first aid for Spanish, Portuguese, Catalan and Italian texts.