I'm not sure there's a realistic plan that has racing continuing without a break. I'm not a doctor or nurse but I work with/for a bunch of them and they've been right so far. So I'll speculate a bit too based on what I've heard.

I can't see any sport resuming in full without daily/regular tests, or at least a test and then you stay on site once you test negative and are only exposed to others who test negative. (Logically we'd see the same thing for all jobs, though financial and political pressure might prevent this...different topic.) So, your plan is on target there. I could see an NBA playoff tournament if the players are tested and then stay on site and play in an empty arena, neutral location, no fans. (If you're talking about six months or a year from now, different story, but I mean in what would be considered the time frame for a "normal" season.) I can see baseball in June with similar regulations. But having sufficient testing is the first step to getting a sport started again as a television/gambling property. Substitute "horse racing" for NBA players---keeping in mind that EVERYONE would have to be tested, and maybe what you propose could come to pass.

Fans in attendance? Travel? Highly uncertain at best in 2020.