Hi Dave. Not sure if this helps but I use a slider in the header area in place of the logo on a site I look after (not GP theme but theory should still work). If you use something like meta slider you can add the link. Of course if you don’t want the slider (ie; motion) then only add one image to the slider. You can also set the slider dimensions to the image you wish to use.
Quick fix, not very difficult to acheive and gets the result you may be looking for.