Good calc, here's some other benefits.

herd immunity: Vaccines benefit even those that don't take the vaccine now. eradication effects: vaccines benefit those that don't take the vaccine in the future.

fertility increase: non lethal cervical cancer can cause inability to get pregnant or carry a pregnancy to term. I don't know if it can cause birth defects.

Life Years: Early deaths save more Life Years than diseases that protect against later disease.

Quality Adjusted Life Years: Very nuanced, and I don't know how HPV cancers compare against the baseline of QALY. But being a vaccine that prevents, the Quality of life gained should be 100%, which would compare positively to treatments that do not cure completely