I would go into a shop and ask since there are some options.
Short shaft is 15", long shaft is 20", "kickers" are longer yet and I think 25". You can also get a tip-down mount that should allow you to use a short or long shaft. I've seen them on boats but have never set one up. This may allow you to consider a short/long shaft over a kicker unit which allows for some more options when you search for a sale or bargain.
4 stroke will be quiet and idle all day better than a 2 stroke but the 2 stroke will be cheaper and lighter. As a permanenet kicker, weight should be no issue.
They can also be set up to run on your big engine steering, controls and on-board fuel. Electric start is nice but not really necessary.
The 25 foot Sea West I was on last week in BC did just fine with a 9.9 HP.
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