Actually, I think the problem is how high are you willing to go. I'd think the Olympus 14-35 f/2 would be a great wedding lens, but it is $1900 at B&H. And you can certainly go wide with the Oly 7-14 f/4 (which is $1500) or the Oly 11-22 f/2.8-3.5 ($630).
I think, simply because of the crop factor (1.5x/1.6x vs. 2x) and popularity of Nikon and Canon, you might be able to find some lower cost alternatives for fast wide angle glass, but there's nothing really stopping you from achieving it with your Olympus gear if you're willing to pay for the glass. All three of the lenses I mentioned are listed as available at B&H.
Going with old manual-focus OM lenses probably isn't the way, since all of those were designed for 35mm film, and you're not going to be finding anything wider than 18mm, and that 18mm lens goes for about $1000 these days, given how popular it is with Canon 5D shooters as an adapted lens.
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