Rule - Tournament Dual Port Livewell Pump 500 GPH Angled (arnoldsboatshop.com.au)
What about this .
Used with a 30 litre round bucket on transom.
I wouldn,t mount bilge pump, but instead attach two hoses to the pump and throw one over the side to pick up water and one in the 30 litre bucket.
As bucket is on transom I could drill a hole for an outlet in bucket and it could run over the side of transom?
Reasoning is space is a premium and I only need to keep a few livies every once in a while as boat is used for family chill trips also.