Give us a few more details if able, maybe some ideas will appear.
Have you approached the CAA for advice? They are unbelievably helpful.
What are the airspace restrictions that are causing a problem?
Would have thought most aircrew less familiar with GPS approaches than SRA, which is a recognised procedure with published approach plates; check out
www.ais.org.uk
Don't know the level and detail required for a response as you only registered yesterday! Hope you aren't trying to make up a D-I-Y GPS approach....other than that ....ask away. Lots of examples of GPS approach plates available.
Kind Regards.