Did you run into MPS ownership blind other to how it looks?
You are prepared for the upkeep, maintenance and running costs of course?
The 2 common options:
Cobb
This is not locked to car, so can sell and use on another vehicle.
Cobb V3 and cable will allow you to flash the maps but you will need to create them on a PC.
there are OTS maps available but they're not the best.
Unfortunately Cobb have recently removed the AccessTunerRace Free software that was available to allow you to map the car yourself.
If you have a copy of this already it will work, but is tied to the specific platform (one initially for a 3MPS wont work on a 6mps)
Without this you are tied to their "Approved tuners" and pretty much all of them are US based.
Versatuner typically has a lesser cost than Cobb and extra software, is locked to vehicle and VIN so cant be sold on.
With this you can map til your hearts content, you don't NEED the official Versa cable, others are compatible, this is advertised on their website.
You will need a Windows Laptop or a Tablet with a USB port, there might even be someone near you that you could loan the cable from
The most preferred tuner in the UK is DJJUT (Justin) over on the MPSOC and he's mapped pretty much all of the community MPS's
Other companies do advertise that they map these, there's even a few on eBay advertising it.
TotalPMS, BBR and ECUTek all "think" they can map them but there have been some horror stories.
They'll be cheaper than tuning properly but use them at your own risk.
As Nasher above does mention, be aware if mapped incorrectly it may cause issue
Sorry for slight derail
As above OP if yer not lookign at keeping the car at long term I'd not bother.
Even more so on a car that may not respond as well to remaps as other.
Saying that I'm unaware of how these respond an my little bro has a knackered old astra Runnign almost 550bhp (supporting mode needed lol)