You do know that your UAS hours (if correctly logged) are available towards the PPL. In addition since they would be logged Takeoff to Touchdown, you are allowed a reasonable allowance for taxi time that will further increase your hours towards PPL (10 mins per sector - 5 at the beginning and 5 at the end, unless you had long holding times as a suggestion).
Have you considered applying for the GAPAN and Air League scholarships that are available for PPL?