Newbie interested in 2002 Islandia

[RepNJ]

Hello! I’ve been stalking the threads for a few hours now because I’m interested in buying a 2002 Islandia - Mercury Powerhead 240 HP two stroke. $4500
The catch is, the ad states “NEEDS NEW MOTOR/ powerhead needs replaced” and that’s honestly the extent of the information.
I grew up driving around a little Boston whaler on the bay in NJ, but really did not retain any knowledge which would make me an educated boat owner. SO, after wasting my night searching, I still have some Q’s

1. Chances of finding a certified Merc mechanic landlocked in Colorado? (I understand that there is difficulty with finding maintenance/parts for these motors + sea-doo)
2. Ballpark price for full repower (parts & install labor- I will have this done professionally, obviously, and assume all will need to be replaced w/ a remanufacture, likely not rebuilt.) looking at $3k, $5k, $10k!?
3. is $4500 a fair price for the work needed? (I’ve searched nationwide and do have a good average)
4. I now really have my heart set on an islander, should I be weary of the 2001-2004 models bc of the potential engine work?
5. Will I have to replace with the same merc engine? Can it be upgraded to a 4 stroke? Is that recommended?
6. any other tips before buying??

any and all info and advices is welcome, (please don’t judge my ignorance ) and thank you in advance!