I bought my Pearson 36 without an inboard motor. We built a custom bracket to bolt an off the shelf bracket so i could fit a medium shaft outboard on the back of the boat to move it around. Once i put a diesel back in the boat i plan on leaving my bracket in place on the stern. Ive got a 9.9 longshaft that i use on it now that i will leave back there.
In this picture you can see the bracket ive been using for the last 2 years. Also thats a 40hp outboard on there. I would keep useing it, but it died.
Now in this pic you can see the first bracket i made. This one was junk, i bought the motor mount at a marine junk store for $10 and found the 2 peices of angle iron in the boat yards scrap pile. But it did get me from the yard to my anchorage with a 15hp motor.
I say go for it if its what you want. Also look at it this way, you always have something grab onto and pull yourself onboard.