OP:
My UK wife sponsored me as the director of her own limited company. The salary she paid herself was under the 18,600 minimum, but her dividends did count to meet the requirement. You will want Category F for your financial requirement.
Self-employment requires a TON of paperwork. The only advantage is that, depending on when your fiscal year starts, you have a lot more leeway for meeting the 1-month window for paperwork (as you have to show tax returns, etc. for the previous financial year, vs. non-self employed people who have to show paystubs, etc. that have to be recent).
As to a quick romance, my wife and I had been online friends for over two years but had only been dating for a few months before our marriage. Some steps we took to prove the authenticity of our relationship:
1. Kept boarding passes for my visit to her and her visit to me
2. Kept records of our instant messages, FB conversations, blog posts, etc.
3. Kept records of gifts, cards, and letters we mailed to each other (dated envelopes with the postmark, package tracking receipts, etc.)
4. Included all relevant preparations for our engagement and wedding, such as receipts for engagement ring, wedding rings, emails to book the church, receipts for food for wedding reception, etc.
5. Wedding invitations/announcements
6. Photos from the wedding, including a photo with all of the attendees
7. Cards we received at the wedding
This would be overkill for a normal application and not recommended, but due to our very short engagement/romantic relationship we needed to prove that we were genuinely in a relationship. I think we added some more stuff not mentioned here (it's been a few months and I've tried to forget the pain of the application!
).
Don't underestimate the difficulty of proving you meet the financial requirements. We had a list of self-employment papers that was ridiculous. Our original package weighed well over the 5 pound limit, sigh.
******It took my wife FIVE MONTHS to gather all of the needed paperwork.******
In our case some of it was due to a deadbeat accountant (who did come through eventually), but the paperwork really is that involved and complicated.
First thing: If you have any plan to apply for a spousal or fiancee visa, make sure you get PAPER bank statements immediately. You'll need paper bank statements for the last full financial year for your business, and they take both time and money to obtain (if you've gone paperless...if you haven't, you're in luck).
And you'll need to get your accountant to prepare paperwork to prove that your business is legitimate and making as much money as you say it is.
Have funnnnnnn...
As to the visiting each other extensively advice...to some extent, you'll have to wait a few months anyway due to the time required to collect paperwork. Category F is no joke. But if you feel this is right and your fiancee does as well...sometimes it is worth jumping off the cliff. My wife and I went from best friends to fiancees to spouses within four months. So there you go.
Best of luck!