Hi, Albie.
Welcome to the forum, mate.
There are very few blokes on here who've had penile implants. We've temporarily lost our search facility so I cant direct you to conversations on the subject.
As far as I can remember, most have found the op a bit problematic and haven't been totally satisfied with the results.
I know I was once considering the procedure but decided not to after doing various research.
I'm not medically trained but from your history it seems that you've been 'cancer free' for 11 years, but have had no erections during that time. I'm wondering whether this inactivity and the likelihood of penile atrophy would effect your suitability for the procedure.
I'm surprised that youve found penile injections ineffective. Are you sure that you were injecting correctly?
A few weeks ago another poster asked a similar question to yours. He'd found injections didn't work, but after questioning his injection technique, he tried them again and they were effective.
This conversation may help you.
https://community.prostatecanceruk.org/posts/t29845-Hooray-for-Invicorp
My advice, and the advice from at least a couple of the lads who've had implants, would be to give injections another go, before deciding on any operation.
Best of luck. 👍