Jenny,
I'm sorry to see the two of you getting hit with this.
The treatment you describe is, I think, exactly what would be offered here for your diagnosis. It should slow the disease progression for a while.
During COVID-19, some patients have been offered Abiraterone or Enzalutamide instead of chemo because of a theoretical extra risk of COVID-19 infection while on chemo, but some centres have said having chemo while on hormone therapy doesn't seem to increase COVID-19 infection risk, and are sticking with chemo.
What should happen is the hormone therapy brings the PSA down, and then the chemo brings it down further, or helps to prolong the length of time it stays down on hormone therapy. If it starts going up again, they would then add Abiraterone or Enzalutamide as extra hormone therapy drugs, or do further chemo, to try and bring PSA under control again. (Abiraterone and Enzalutamide are notoriously expensive.) All these options (besides basic hormone therapy) will depend on liver function.
If cost is an issue, you could think about having bilateral orchiectomy (castration) instead of the lifelong basic hormone therapy, since that's a once-off cost, rather than ongoing lifelong hormone therapy, depending how much that costs. (Ball-park figure for hormone therapy using GnRH analogues is around £250/quarter in the UK, but it depends which drug they use. There's a trial running using Estradiol patches instead, which are significantly cheaper and fewer side effects, although may need more monitoring.) Orchiectomy wouldn't work to replace Abiraterone or Enzalutamide though, which might still be used later on.
The procedures you've already had would probably cost more than £3000 in the UK, if done privately, but somewhat less in some other parts of the world.
Wishing the two of you all the best in the circumstances.