Consider reaching out to High Impact Professionals, a new charity which is helping people organize workplace giving campaigns. I'm not sure whether they'd have advice on getting donation matching set up, but there's a chance!

I’ve also been encouraging HIP and others to try to keep a systematic record of what works in convincing employers and mainstream organisations to support effective charities in their CSR and employee matching activities. … Or at least to not limit their charity support to local (and usually less effective) organisations.

You can see some of my earlier thoughts and attempts to try to get this knowledge sharing going at innovationsinfundraising.org. I think it may be a good project for HIP to take the lead on?

Some quick thoughts… Seem e.g. innovationsinfundraising.org

The evidence suggests that donation matching may not actually lead to people who donations are matched to necessarily donate more out of their own pocket.

However, it could be that by advocating donation matching you get more donations In total, as the idea of donation matching motivates the matcher to give more as well.