I think you mean coil-split, taking the humbucker and "splitting" the two coil so you have a single coil option? The two terms kind of got blended together at some point, strange. An actual coil tap involves "tapping" into the wire coil at some point late in the coil, so you can effectively have a pick up with a 6 ohm output with the coil interrupted and boosted to 8.5 ohms when the entire coil is utilized via a switch.
You can split any passive humbucker (unless its epoxy sealed) If there are 4 (or 5) leads from the base plate it wont require any access to internal parts of the humbucker. If there are four leads, all you really need to know (besides the circuit and I know you can handle that) is what color wire corrisponds to the beginning and end of each coil. I'd be willing to bet there is a Pacifica forum with that dope.
If the stock bucker has a braided lead, get a nice used replacement with four leads then go ahead and rip that stock one open and try to do the split yourself. However it ends up, you got a splitter. http://www.stratcat.biz/4022.shtml
I have found this type of mini toggle switch mount for less, but I can't find it right now. I have been racking my brain trying to find a reason to use one of these mounts on a strat. It looks really clean and custom installed, you can only see it if your looking and way cooler (and easier I think) than a stacked pot to operate. Google Gilmore start to see one installed.