I am amazed that a 4.50 went in there in the first place, I took the cheats way out and bent the left hand side of the swing-arm out to fit a slightly too big (can't remember the metric numbers) rear tyre to my wife's bike in an emergency.
To get that one out I'd beg/borrow/buy a large set of what we call "multigrips" (known elsewhere in the world as "water pump pliers", slip-joint stilsons", "metric-all size" and various other names. Position the wheel as near as you can to "out" and then start squeezing the tyre above and below the "pinch points".
Trust me, this will take a while, but it will work. Or, you could slip a large 6' section of water pipe over the left hand side of the swing arm with the shock removed and bend it outward until you have sufficient clearance. To bend it back - fit rear axle and use a 5lb hammer and a block of timber to move the LFS of the swing arm back into position.
Do not stress that you will damage anything doing this, you won't.
The LHS of the swing arm s largely there as a mount of the LHS shock sand does not contribute very much to the overall strength of the swing arm.
I have taken a stock R65 swing arm, cut the LHS off about 4" rear wards of the pivot and fitted an R80GS final drive. Put the whole confection into a frame that a friend was building up (Cagiva elefant front end, R100 engine, R75/7 frame with mono-shock mount grafted on and Monolever subframe.
He rode the 7 deserts of Australia on that bike, and it failed to break.