On your boat... it should just work. On the Islandia... I needed an extra 8" or so, to get to the center of the engine.
Personally... I would just take the engine out. You really can't set the engine back down on the fiberglass... and it will be in your way while trying to get the pump out. AND... if there is a problem with the crane... and the engine drops... it could get ugly.
It's not hard to take the engine out (it's easier than a Rotax) But it will take a little time.
Basically, you will:
1) disconnect the throttle cable
2) disconnect the steering assist cable
3) disconnect the oil hose. (and cap it)
4) disconnect the fuel hose
5) disconnect the battery cables
6) disconnect the electrical. (one big cord)
7) disconnect the exhaust hoses.
8) take off the bolts around the base of the engine
From there... it will lift out.
FYI... the exhaust hoses are going to be the biggest pain. They are simple, in the fact that it's just a clamp... but the rubber is stiff, and it could be stuck to the flange if they've never been apart.