If you are currently running 225s, i'm guessing those wheels are around 7.5" wide, so i'd potentially look at something like the General Grabber AT3 on a 235/55/18 which is a nice chunky tyre. It might not fill that gap equally, but I can see what you mean, and it will loose a fair amount of it visually. Maybe consider some wheel spacers to bulk out the wheel even more, and possibly a set of the genuine VW arch kit. The arches will finish off a nice Swamper look, but also the Black arch against the Black tyre should give the illusion that there is more wheel/tyre as opposed to the Black tyre against the White arch if that makes sense.
Welcome to the forum and next time, careful asking opinions, because we can spend your money much faster than you can