Is there any way to buy or make a simple switch to share an ADB keyboard with two Macs? I see full-fledged KVMs out there, but they're overkill for what I'm thinking of in terms of price and features ...

While rooting around in my loft I came across an old ADB keyboard, it's an Apple Extended clone (By someone called Icicle according to the sticker on the bottom), this seams to be 'buck spring' board ...