Google Maps API required for Mobile Site

I use a number of Joomla extensions that use google maps. In the extension I specify a Google API key for my main site. When I access my mobile site I get a message ' This Site needs a different Google Maps API Key.......' This is because my main site is marylebone.org but my mobile site is m.marylebone.org 

My joomla extensions do not allow for multiple sites. Does anybody have ideas on a work around?