First off, Fox is not going anywhere, regardless of who we draft this year.
Secondly, I really don't see an issue with a Fox and Doncic pairing at PG and SF. Fox would need to improve his 3 point shooting for sure, but he has shown that he has a decent shot, that can be developed. I think Doncic's 3 point shot looks pretty good so far and can be honed.
The myth that two ball dominant players can't coexist and thrive is not true. GSW have Curry and Durant, Houston has Paul and Harden, and Cleveland had LeBron and Kyrie. Those are the 3 most ball dominant duos in the league and they all thrived and dominated the league together.
The key is to spread and move the ball and with the two very good ball handlers at PG and SF, you open up the other spots to players that have a niche role, like Buddy as a 3 point bomber, WCS as a mobile, running big, and hopefully Giles as your prolific big man scorer and rebounder. Bogdan can be the primary ball handler and weapon off the bench.
I think that if the Kings are lucky enough to be in position to take Doncic, you take him and run.
The Kings would have a very young and exciting team with this lineup:
PF: Giles / Skal / ZBO
SF: Doncic / Jackson / Shumpert
C: WCS / KK / ZBo
SG: Heild/ Bogdan / Temple
PG: Fox / Mason