Generally, no.
Theoretically, a 31+ kHz capable screen could accept VGA via SCART, provided VGA's separate HV-syncs are merged to a C-sync (simple logic gate). The RGB signals themselves are the same.
The only other option is getting an RGB to YPbPr converter, I'm afraid. S-video will not be able to match higher than VGA resolution (and would require conversion as well).
