Glad to hear the good news, excited to see what the new forum software will be like!
Have you ever looked at CloudFlare? I beleive the free tier has no bandwidth limit and so ukvac could use it for free.
- It proxies between the users and ukvac servers, so it can add an HTTPS certificate without you having to make any change to your server.
- As a bonus it offers caching, so reduced load on your servers == less cost (unsure how you're billed)
- You'd have to move your nameservers over to cloudflare, but cloudflare will automatically detect your DNS settings and so there shouldn't be any downtime.
Just a thought, as it would stop everyone complaining + would probably take an hour or so of configuration, and if it broke completely you could just swap the nameservers back, and after another hour or two everything would be fine.