i'm not going to pretend to know anything about the foreign guys or the g-leaguers, but based upon the guys i've seen in college this year i'd be fine with:
1. Donovan Clingan - think he'd be a perfect backup to Sengun and provides a defensive presence that Sengun lacks
2. Rob Dillingham - electric scorer. may profile to a 6th man/Lou Williams type of role, but that's fine the Rockets don't need this pick to be a star
3. Cody Williams - defensive wing who can be Tari Eason insurance
4. Jared McCain - would fill a similar role to the one mentioned for Dillingham. better size and probably a better shooter, but more of a one dimensional scorer than Dillingham
5. Dalton Knecht - another scorer, who could start or come off the bench
6. Stephon Castle - big, defensive guard with questionable jump shot. sort of in the Amen Thompson mold though obviously not as athletic.
Given that there should be several foreign and g-league guys picked in the top 10, my assumption is that it is very likely that at least one of these guys will be available whenver the Rockets pick.