My D did two as a rising sophomore (though not either of the ones you’ve mentioned) - check out:
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Between The Lines (through U of Iowa and the International Writing Program)…it’s a combination of creative writing and cultural exchange. The Identity and Belonging version is 2 weeks on campus and free of cost for the students selected to participate. (It is a more niche program than the U of Iowa main program so I don’t think entry is as competitive).
Between the Lines | The International Writing Program
My kid had to do it virtually due to Covid guidelines at the time, but last year they were in person, and the photos they posted of the experience looked great. -
Denison Reynolds Young Writers https://reynolds.denison.edu/
8 days on campus. My D (who also had to do this one virtually) liked this the best of all her summer writing programs (though her experiences were probably skewed due to impact of Covid on the programs). Financial aid is available - we were able to get some.
Good luck!