There's been several people here consider the idea but I don't know if anyone went ahead with it and if so, how it worked out for them.
On the plus side, if you're having trouble with the injections or their side effects, this could be a good option. I think I'd give it serious thought if I got to the stage of being on hormone therapy for life.
If you're on HT for life you'll have to deal with some of the side effects of never having testosterone in your system. Cholesterol can go up, blood pressure can go up, bone density can fall [osteopoenia up to osteoporosis is progressive] and muscle loss, while it's not life threatening, does mess with QoL.
I suspect, based on my own experience coming off Zoladex, that having your testes removed or surgically blocked, might be more tolerable than HT because of some of the side effects these drugs have, like poor sleep, restless leg syndrome and generally feeling bad. I say that because in the period after my HT finished but before my testosterone came back, life was significantly better hence, these drugs definitely have side effects outside their intended goals.
Are you on HT for life?
Jules