SSH (or HSS - depending from which end you are looking at) triggers the question: do you want to have a balance between the split humbucker to the SCs or of the full humbucker with the SCs. I understood from the OP that the full humbucker should balance with the SCs, and as these are vintage style pickups, a low output pickup, e.g. PAF 36th Anni, PAF Master, Air Classic, Virtual PAF or Virtual Hot PAF would be the way to go. Personally I have only hands-on experience with the Virtual Hot PAF, in combination with the Area 67 in the neck and the Virtual Vintage 54 Pro in the middle, and that to my ears is a balanced combination.
Cheers Stephan