Tim,
I guess there are two things:
1) How best to recover erectile function, and
2) How to have sex now.
No 1) is penile rehabilitation and it sounds like you're doing the right things, PDE5 inhibitor (even if it doesn't give you an erection), and using the pump to ensure you are getting frequent erections. I would also suggest trying Tadalafil (unbranded Cialis) instead. It lasts much longer and with appropriate dosing can achieve continuous dosing, which may be more effective for penile rehabilitation.
For 2), you may need to try something different. Again, worth seeing if Tadalafil works any better - different of the PDE5 inhibitors work differently in different people. However, you may want to talk about trying one of the vasodilator drugs, which are mostly injections into the penis, but some other types are also available. This may be temporary while you wait for working erections to return. It's also good for penile rehabilitation. You would initially need to be shown how to do the injections in an ED clinic, and you can probably most easily get an appointment by asking your CNS.