I like what andos is saying about cutting and welding on other arches. I nearly done the same with my old 1200 but mine was cause it was too low not the tyres were to wide!
First I lowered it and drove for a few weeks, then I wanted it lower ( I only had 14in 185's) so in with the new springs and out with the air hacksaw and cut the front arches 1/1/2 inches higher. I then went to the wreckers and cut out some arches, Kept them in the garage for ages, then I took the car off the road. I fixed some rust up then I got my 1000 and all of a sudden the 1200 required to much work, so off when the 1200 and into the garage went the 1000. Now nearly 2 yrs later the 1000 is still in there but nearing finish ( yeah right) and has received more work then it would have taken to finish the 1200!
Bloody cars!
1 other thing, 1200ute8u1 my little man I understand what you saying about your pops 4wd but as most of us would have seen, wider tyres on a 1200 or a car for that matter are gonna stand out more than a 4wd, plus on a 4wd it looks good!
But hey I get where you are coming from mate!