Do without? Hire someone to fix the plugin? To an extent it's an inevitability, if you don't want problems with upgrades then don't modify your forum. Jelsoft themselves will tell you that.
I appreciate the troubles of your situation but people's work can't be comandeered for convenience no matter how long it's left for, I can't imagine that vB.org would ever allow anything along the lines of what people are suggesting here.
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