1) superficially yes. if you've been freelance for 2+ years and can prove it with paperwork and references etc then yes.
2) if you're an athlete or artist then you need to be operating at scale that your work and name are known around the world as one of the best in your field. For supporting roles in the Arts and Athletics then the 2 year minimum is the main requirement but the longer and more high profile your freelance work the better your chances. NOC 5241 is on the list of work types for the SE program but in all honesty I'd go down the EE route, the benchmark of "World Class" or high profile isn't there and if you've got high enough IELTS and CRS score then the SE route is a waste of time and cash.
3) Yes, you can still apply under EE while doing this.