You could fairly easily get a PPL (Bit of training plus a flight test + some writtens ((probably in excess of £1000)) In theory it might then be possible to get a UK issued Instructor rating (more cost), but getting work with it will be the biggest challenge.
Currently, converting your commercial to a point where you could be of interest to UK airlines would involve many thousands of pounds and getting a position would be an even bigger challenge.
Of course, things could change in the new year...............