Definitely will be interesting to see how it all shakes out.
At his point I'd start with the all star starters and add and eliminate from that:
Guards - Young, Curry, Morant
Forwards - Durant, Giannis, DeRozan, Lebron, Wiggins
Centers - Embiid, Jokic
Need a guard and 1 less forward, and Wiggins seems like the pretty clear guy to remove. So take off Wiggins and assuming he is a guard Doncic seems like the pretty clear guy to add. I don't think anyone else makes sense to remove at this point.
Then looking at 1st Team vs. 2nd Team, I'd do this
1st Team - Curry, Morant, Giannis, Durant, Embiid
2nd Team - Young, Doncic, Lebron, DeRozan, Jokic
That just leaves the 3rd Team
Guard choices: Paul, Booker, Garland, VanVleet, Mitchell, Harden, Beal
Forward choices: Wiggins, Tatum, Ball, Green, Butler
Center choises: Towns, Gobert, Adebayo, Davis
I'd probably go with this for 3rd Team at this point (and accounting for injuries, so Paul removed)
3rd Team - Booker, VanVleet, Tatum, Butler, Towns
Lots can change between now and end of the season and games played is definitely going to be a factor down the stretch (Durant, for example, hasn't played enough).