Can I Switch to F-1 and seek Adjustment later when dates become current for my I-485?

There is a requirement that individuals in F status maintain a foreign residence that they have no intention of abandoning. In other words, they cannot intend to immigrate while in F status. Since you already have an immigrant petition approved on your behalf, you have expressed your intention of becoming a permanent resident. This may be a problem when seeking change of status from H to F. The change of status petition could complicate your immigration and future adjustment.