Hello Bob,
I had a Parker 285 (Spartacus) which I sold last year. It had a removable inner forestay fitted by the previous owner. It was a marvellous bit of kit that I used quite often when the forecast was F5/7, especially if not going downwind.
It had the deck plate for the forestay fitting reinforced by an attachment to the stringer in the anchor locker. I can't take a picture because I no longer have the boat. But maybe the current owners might if you contact them. They are members of the Association.
As it happens I was watching the latest video this morning from Eric Aanderaa - he has a YouTube sailing channel that is absolutely amazing. I cannot recommend his videos highly enough. He has just fitted an inner forestay on his Contessa. You might get some ideas. See the attached link.
Mike Baldwin
Shemar 335/46