Hi Volare7266
As far as I can ascertain, the "official" source of aeronautical publications for St Helena is via ATNS South Africa (the air traffic services provider) who have been contracted to handle this.
If you go to the ATNS SA website, choose "Products and Services", then "Air Traffic Management", look down to "Projects" and you will see the St Helena index page.
There's the full package of aerodrome info, approach plates and the AIP and AICs. (And the local aerodrome regulations you refer to.)
I'd have expected these to be accessible by a more friendly route, but perhaps that will be sorted out eventually.