I think you're overstating the difficulties here.

The overwhelming majority of people use the same one or two computers (one at work, one at home), and don't mind using a laptop keyboard when travelling to a meeting or visiting a client.

Anyway, since you're in Europe, don't you have a mixture of keyboards amongst your colleagues anyway? I certainly do -- I've noticed US, UK, Danish, French, Swedish, German and Russian printed keyboards. There are also about 4 kinds of ergonomic mice in use, of which two look pretty weird -- and the users of these mice are not developers, they just had/have RSI issues.