Follow up: We ended up going with cseltzjr's recommendation and installed a small diaphragm pump (3/4" ID hose) on a pre-existing shelf in the aft part of the starboard lazarette. This pump has its float switch as low as possible in the bilge sump. It's equipped with a Pumpgard screen and a check valve on the inlet hose and a vented loop on the outlet hose.
The original centrifugal pump (Johnson 2200 GPH) has a slightly higher float switch, 1.125" ID hose, a new vented loop up near the starboard primary winch (inside the lazarette), and no check valve.
We like the idea of the small pump (which is quieter and further from where we sleep) to deal with "maintenance water" like what gets down the mast when it rains or through the hawsepipe when we're beating upwind in waves. For serious pumping, which we hopefully never need, the bigger pump can take care of it without any check valve worries.
The two pumps have separate thru-hull discharge just below the rub rail on the starboard aft quarter. These thru-hulls are sometimes submerged when we're at full heel, but the vented loops will prevent siphoning water into the boat.
Cerbo GX counts the number of times both pumps activate (either manual or automatic), so we can keep an eye on what's going on when we're away from the boat.
Thanks, everyone, for your suggestions and thoughts.
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