Hi Simon,
Before you go any further, you should perhaps look at this:
SRM 7.0: Running it without the Portal
This implies (to me) that SRM 7.0 prior to EHP 1 runs only in the Portal.
Just to clarify (for those new to this thread): Up to now, we have been comparing NWBC with Portal Client. So in theory, you could run SRM 7.0, (EHP "zero" ) on the Portal stack, with NWBC as client.
However, we really don't recommend this for everyday use. Portal client is optimized for the Portal stack; NWBC is optimized for business suite systems on an ABAP on-premise stack.
(For more details of when to use what, see my blog:
When to Use NWBC - and When You _Really_ Shouldn't )
Just thought you should know before you make any decisions.
Best wishes,
Julie.