Thanks for all the feedback everyone. Got some ideas to work with here. I have some spare covers from my last JB build to experiment with. Whilst researching some other options first up I'm going to widen the 2x outer pole piece holes to allow the PUP poles to fit into place. If I can get this symmetrical it may (or may not) look ok.....
There seems to be a few sellers on fleaBay selling covers with no pole piece holes. I'll have to make some inquiries into the screw to screw distance measurement.