What Ron & Neil said. You can simply abandon that pump and let it spin away, and either mount something to run off the flywheel (Moyer has the bracket,
https://moyermarine.com/product/seaw...nting-bracket/), or Indigo makes a mount to hold a Moyer pump in between the alternator and accessory drive pulley (part of one of their FWC system), but I assume you can buy just the bracket if you didn't want to fabricate something.