Despite your advice against it, I still went ahead and bought myself a Touch Bar model of the 2018 MacBook Pro. It has an i7 2.2GHz 6-core processor, AMD 555X with 4GB, and 256GB of storage. If it turns out to be fine, then I'll sell my 2015 model.
The device is still on its way to me, but it should be without issues, everything works, and the keyboard is clean. The only problem is the sticker marks, which is a bit of a challenge since they've been exposed to sunlight. I might try placing it under direct sunlight to see if it helps.