>T480 is the same as T25, so you may be able to use T25's keyboard with it

The mod is complicated and very, very expensive. But possible, if you can find one in your preferred layout, which is very doubtful at this point - they've all been snapped up by people doing what you describe.

I do use the T25 keyboard on my T480. Is it nice? Oh hell yes. Was it worth the time and expense? Absolutely not, unless you are a serious keyboard nerd and have more money than sense. Which I did, at the time.