I didn't want to name Chris either so pleased that you outed yourself!
NHS stats say 20% of men with nerve sparing remain totally impotent 12 months post op, even with the use of tablets / injections / pellets. The chance of a man with non-nerve sparing getting natural erections is less than 3% and Viagra / Cialis cannot cause an erection, they only enhance it. The fact that Chris's surgeon is assuming some nerves were left behind supports the notion that generally, it ain't gonna happen without them.
Alan, don't pin all your hopes on a treatment that is unlikely to work - perhaps have another conversation with the ED nurse and ask him to explain to you what you can realistically hope for. My guess is that without the regular exercise of the pump, injections and pellets will not be very successful either - in those 7 months, there is likely to be some permanent damage to the spongy tissue of your penis and the longer you allow that to happen, the less healthy tissue there is to engorge.