The dreaded roof underlayment replacement

95 townhomes, northern CA. Reserve study says underlay need to be changed in 2033, houses built in 1989 so we are stretching it out to the absolute maximum! We budget $30,000 per year for leak repairs. Anyone had experience of convincing owners to pull the date forward, with a Special Assessment and some financing options. If we wait until 2033 and increase the reserve contributions by 10% annually until 2033, then we will have little to a small assessment.