I'd look at getting and fitting a VLX53 5-way switch. It's the switch Ibanez use on their HH guitars which makes getting various pickup combinations with splits very easy.

https://www.realparts.com.au/vlx53-h...er-switch.html

34mm deep though, so check you have the depth.

This is the standard Ibanez HH configuration selection. A bit different from some, one could say rock biased with no individual neck or bridge single coil selection.

Click image for larger version. 

Name:	DiM_8poleRev2.jpg 
Views:	203 
Size:	76.1 KB 
ID:	41087