I contacted Whitby via Wenger to ask about inline phillips options with non-locking blades, as all the models that seem to be out there at the moment are for S54 and S557 etc with the new locking blades. Whitby got back to me saying they do not have any in stock, and they would need to order them in specially from Wenger in quantities of no less than 10-off for me.
If anyone is looking for inline phillips (locking) with non-locking blades at any point, I would suggest checking Felinevet's listings for the older models, or we would need to pull a group buy out of the bag