Your gut feeling is correct. It's generally uneconomical to do such a wing swap. That's why it's for sale at said price. You're unlikely to be able to sell that thing to someone in your same purchasing demographic, and the flight school already made the calculus and figured the wing swap doesn't pencil out versus just procuring another clap trap to use in their trainer fleet. So if you don't think you're gonna put 2000 hours on it, and I'm willing to bet you won't; most people upgrade to six bangers once they realize sub-200hp UL and power-loading sucks, or simply tire of certified mx BS {I'm increasingly in the latter camp} and lateral into the bliss of EAB. Don't buy it would be my advice.
If you're gonna deal with the quirks of an orphaned honeycomb composite-component airframe with dwindling support in the 21st century (to be clear, not the only factory-built airplane with such fate, before the cult starts foaming at the mouth) , might as well get the right sized power sample, aka a Tiger. As you probably know by looking at Cheetahs in the first place, the Tigers are cult priced and may not be worth the squeeze, but that's a subjective assessment.
If you know you're gonna move up from the get go but can't wait until then to get an airplane, just get a proliferate airplane variant (PA-28 et al) until you can save up for the six banger airplane you really want. Leave the Antique Roadshow ownership antics to the type cults, lest you belong to one of them of course. Good luck.
