Also second apologies for the long winded post, I don't blame you if you don't read it

I have a 97 gen4 sw20 g-limited that has just rolled over 190k's, has been a very solid car for my five years of ownership.
Coming near that magic 200k mark got me thinking about what might need doing, does the engine/box have to come out to do the cambelt and other stuff that should/needs to be done?
Has one crunchy syncro on third (shifting down) which has always stopped me from bothering with track-days etc in it - I'd like that rectified also.
Then the man-maths kick in as I'd like to have torque again, I started to think I could just sell it and buy something else... but I like MR2's and it seems rather hard to find a decent gen3+ turbo these days.
Drift-tax seems to have put half-decent rwd cars into no-so-economically-awesome prices.
Getting down to it, given I have a solid base of a car I started wondering how much a turbo swap would cost me.. I know the usual advice is sell it and buy a turbo.
I have no garage (or even a flat driveway) with which to do work myself, so I would be paying someone to do it for me.
I have read somewhere on the interwebs if you were to get a half-cut of comparable year everything should fairly much slot straight in? (1 pin / wire difference on ecu for factory boost gauge)
Am I even more foolish than I already think I am? Do I need to snap out of it and just keep the 3SGE, maybe rebuild the gbox?
If not can anyone recommend a good company I could talk to about importing a half-cut? I was guestimating maybe 3.5K odd just to get the half-cut in and another decent chunk to get it bolted in.
Also would you need a cert or would you just re-register it as a GT spec (fairly sure the brakes and the like are the same on the later model turbo/non-turbo models?)
Well done if you made it this far and thanks in advance for any advice