If you are dead set against an I/O, a single outboard on a short bracket should work. You may find that the 250 is too slow in a calm water cruise mode for your desire. However, the hull runs so much faster than most hulls when it is bumpy, that the average is a lot closer than it appears at first. I went from a 24 Seabird deep V to the 25, lost 2-3 knots calm water cruise when loaded heavy, but, on long open water runs I still get there sooner with the 25. Much sooner if it is bumpy. I just don't need to slow down in any conditions I'd have been willing to take the Seabird out in. If it really gets nasty and you need to slow down below 18 knots, I think you will not like that 250, because it will probably want to jump on and off a plane.
Balance will be tricky and will take some experimentation. You can allow for moving the CG aft by adding weight, water or fuel or pig iron, under the berths. The boat really does like weight forward. Tabs help, but just are not the same thing Vertical CG might get you. Because the boat is very very sharp, it rolls. The VDH hull keeps it from snap rolling,the bane of many deepVs, but only as it was originally built. The hull is very sensitive to raising the CG. As you do things that raise the CG, the roll gets worse and it might start to snap on you. I had a friend who owned one with twin outboards, a hard top and a tower. It snap rolled so bad his wife would not set foot on it, even after they removed the tower. Bildgerat likes his twin outboards and doesn't have any problem with the roll. Make your choices, take your chances.
On the 250 vs the 300. I've never had either, so take this for what it is worth. The 300 will have a faster cruise,probably a bit faster than mine. As a 4 cycle, it should have more torque. Should be fine. Personal opinion, the 250 2 cycle is too light for that boat. I'd be astonished if it had the torque to act right at low planing speeds. Above 18 knots, it will be fine, just not fast.
The 25 takes more power than the 23, not because it weighs more, but because it is so much deeper. You pay for that ride with a less efficient hull.
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