No, I wouldn't recommend you cancel anything at this point in time. If you cancel you will loose the $1070 AOS fees you've already paid. And even if you don't mind loosing the money, submitting a new application with a spouse included will get your application through a much more tougher scrutiny and the possibility of being approved is very ver slim IMO considering this will be a spouse that you do not even have of a history, if any together.
My suggestion is complete your application as is. You can then go home and get married following which you begin the paper work of filing a petition for her. She remains back in your country, you visit as often as you can till the process of bringing her over completes.
Another alternative will be withdraw the current application, loose the AOS fee of course, go home and get married right away, then request for KCC to unlock you form, update your DS-260 form by including your spouse and process CP together. Of course you will still need to convince the CO that your marriage is genuine and it wasn't done simply for the purpose of getting an additional GC. When KCC ends up scheduling your interview of course will depend on when you resubmit your DS form and when they complete processing it. Considering the fact that you don't currently have marriage plans completed, not sure if this option is worth considering.