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withered_preacher
4.5mm either side should be fine, but there are a couple of things to consider.
You'll need to brace the chainstays just beyond where the chainring extends, to maintain clearance.
I'd also brace the frame at the seatstay bridge, so that doesn't get stressed.
You'll need to tweak the dropouts, after setting the stays, to get them parallel again.
Using something to screw the stays apart won't work, unless both the tool and the frame are fixed: otherwise only the weaker stay will move.
There is that...