Where I live, the system worked very efficiently for DH, a lovely doctor rang within hours and had a detailed chat with him about his options.
On thing to note, though: the anti-virals have not been tested on anybody with stage 5 CKD (understandably, it would be a tricky thing to do, ethically), so they are extrapolating results from people with stage 2 and 3 and applying those to all stages.
DH's consultant (head man at a well known hospital) was of the opinion that he should only have the anti-virals if he was feeling ill enough to be admitted to hospital, or close to that threshold. DH was lucky enough not to feel very ill at all, so didn't have them.
Obviously this is a very personal decision, so if you feel you would benefit from anti-virals it may very well be absolutely fine, I'm merely saying they don't actually know.