I was wondering if anyone can advise if it is possible to source a replacement starboard pushpit rail.

My own was damaged in a start line incident last season and isn't suitable for use as a template.

Thats a bugger, I had a similarly damaged quarter rail last year (see sales and wants) but had no joy in sourcing a replacement so had a skilled fabricator effect a repair. I made up a jig from ply based on the holes drilled in the deck, then took this along with the bent rail to a guy who was able to heat, straighten and weld it back to shape. You could get all the angles you need from the port rail. Best of luck.