score:5
I don't know if there's a comprehensive resource, but it's going to be a pretty limited list, so here's a community wiki for it. For inclusion, the hotel must both have their own helipad (flights nearby don't count) and offer regular, bookable helicopter transfer services (unused/emergency-only helipads don't count):
The Peninsula, Hong Kong. If the Rolls just isn't enough, private helicopter transfers from Hong Kong airport for you and your 5 best buddies for a mere 26,500 HKD (~3600 USD) one way. Source: https://www.peninsula.com/en/-/media/files/hong-kong/at-a-glance/phk-airport-transfer-en_04122017-(1).pdf (PDF)
Shangri-La Jakarta, Indonesia
The last four sourced from https://www.businesstraveller.com/news/2012/07/11/five-hotels-with-helipads/ (2012).
No longer on the list: