Can I seek advice?

My church requires about 1 year in advance booking for JP Pastor and we cannot register with ROM first.

So I was thinking of going to ROM and register and sign first. A year later when my house comes, I do my holy matrimony service together with the banquet. Is that possible? Does anyone know of any non-JP Pastors who are able to officiate such weddings.

Also for venues, I was thinking of a common ground like White Rabbit or Chijmes. But these spots have very extensive rentals. Does anyone have recommendations?