I think GW have done the Booking tables thing for a while now, and I think you can book a table, and have it open to a challenger. That what I did a few years ago at least. If you feel you army can take anything on, even in the current Meta, then you could try it, but you'd likely face increadibly beardy lists.
If I had the funds and a place to stay, I could/would come over to Nots to play at WW.
Of course one option would be to start your own club, but you'd have to do the organising of everything yourself, including space, tables, scenary, so on.
I wouldn't give up on finding a gaming group. They're a little under supported by GW these days, but searching around sgould yeild some result. I think Dakka Dakka or another forum actually has a player database that shows where players are and if they're willing to play, so thats another thing.