ouboard motor size what hp?

I am trying to compromise between the weight of motor on the A frame of a van and the lifting and fitting to a dingy when needed........as against safety and convience when choosing a motor too low in hp

the dingy is a bluefin Varmint 3.8m in length and 95 kg. ...beam 1750....... hull depth 780...(max rated is 25hp)

I chose this because of its solid all welded construction and its depth......further out of the water than a shallow dingy........probably no safer from a cranky croc on a mission.... than if I was in a smaller one..but mind over matter will make me feel safer if it ever becomes an issue

occupancy 2 adults............the general area being the rivers/ estuary waters of the Kimberly's, NT and Qld........

in other words capable of running against the tides if it becomes necessary / required.........cruising speed to get from A to B is less of a consideration....more about being pratical and a safe compromise between over kill and under powered

appreciate some input from those who do fish those areas .........I am a reasonably experienced boaty with a larger FG runabout that will have to stay at home as it wont fit on the roof !

at this stage I am thinking a 15hp Mecury Super two stroke

Thanks