1. Start either Glenn Sparkman, Jesse Hahn, Mike Montgomery, or even Stephen Woods Jr.
This is probably the best option for the KC Royals as these three are mainly used as starters in their respective careers. The best of the three would be Glenn Sparkman as he has the most experienced in recent years, as Jesse Hahn has been hurt and Stephen Woods Jr. is our rule 5 draft pick.
The case for Jesse Hahn is not terribly strong, but a couple of things that could help is that he is fresh and is ready to prove to people that he is back and better than ever. For Stephen Woods Jr. the case is a whole lot stronger as for one, we have to use him as he is a rule 5 pick, he is also relatively fresh, along with the fact that he was dominant in the minors which compares to Brad Keller.
The last option for this also happens to be the initial starter Mike Montgomery. The reason I add him here is the fact that no reporter has stated that Montgomery was injured or had tested positive for COVID-19.