I think Prostate cancer should be the least of hubby's worries. PCa in most cases is fairly slow growing, even in guys with normal testosterone. So in the worst case, if he got terminal PCa as you fear, with appropriate treatment he should last another ten years.
If the docs are warning you about
an increased risk of PCa with testosterone shots, they are right. They are obliged to do that. But I think hubby has much more immediate concerns, so if the docs are recommending testosterone shots, then I say go for it.
When I started taking low dose daily aspirin, my doctor warned me of all sorts of dire consequences, gastric cancer being among them. None of that has happened yet...
No symptoms; PSA 5.7; Gleason 4+5=9; cancer in 4/12 cores
Non-nerve-sparing RRP 7 March 2008 age 63
Organ confined, neg margins. Gleason downgrade 4+4=8
Bimix worked well; now using just VED
PSA undetectable at first but now 0.4, doubling time 7 months
No radiation but ADT coming unless I can slow down the rise...