Could you dock with the outboard only ?
Not happily. My wife often docked with diesel only because as I said the outboard didn't like to sit for 6 months and wouldn't idle well or run without stalling.
The tiny low speed jets would get clogged. I wasn't smart enough to use fuel stabilizer.
Lots of Prouts and some Gemini cats used a steerable single extended leg Sillette drives on centerline. Pretty heavy but fairly robust. Not nearly as good as twin engines but saves on the cost/weight of twin diesels.