Hi you have quite a few options there.
I would consider well everything.
Husband is G8 and 74 so we weren't given a choice. We are a very together couple too with a very active sex life and as you say it's just our personalities and who we are so HT and Radiotherapy were very worrying. He's been on HT for a year now and had RT during July.
However if all goes well HT can be reversible in a way RALP may not be if nerves are damaged. They are also a lot of cases of Radiotherapy being needed afterwards anyway.
All I can say is HT in our case has not been the devastating event I thought it might be. If you have a lot of love ❤️ and a good relationship, that doesn't disappear. It's still there. Do message me and I can give links to more information. About 10 to 20% of men who had a good sex life before, still do during HT.