You might try to rent a mic unless you have other uses for a ribbon.
You'll get more room sound with a figure-8 (assuming the mics are currently pointed at the cabinets). 4-feet is already kind-of "far", and room acoustics will make a big difference.
And, ribbons have a reputation for rolled-of highs. Other than that, I think you'd just have to try it.
If you want something "different", have you tried a DI box? That would be cheaper than a mic and there's an almost unlimited number of amp/cabinet simulators (at little or no cost) that you can optionally blend with the acoustically recorded tracks. It's pretty common to record one track direct and another with an SM57 in front of the cabinet.
...There are a million different things you can do and a million different combinations of guitars/cabinets/pedals.
I've never done M/S recording, but I think the mics are usually matched (similar frequency response). However, that probably isn't necessary since you are looking for effect rather than accuracy (you're not recording an orchestra).
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