Haven't done that route yet, but my best shot would be for you to pass via Antipolo towards Sta Cruz Laguna going either Los Banos or San Pablo, and onwards down to Rosario. Must be a scenic ride all the way!
Not sure if it will be shorter, you might also want to consider passing via Roxas Blvd., onwards via Aguinaldo Hiway to Imus, Dasmarinas, Silang Tagaytay, Batangas City then Rosario. That way you won't be passing by SLEX or any other motorway that might not allow your 125cc.
Good luck! Welcome to VT and come back to tell us how it was!
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