That's a good one but you can make one with just the charge pump part all transistors no fet's that works just as good with haft the parts . Ive made a bunch of them the best one that I came up with 22 parts and woks like a charm for 5 volt chips
There not much to it Vpp feed back Vdd feed back and a charge pump all you need to program 5 volt chips
You can program the 3.3 chips if you cut the usb power and use a 3.3 volt supply
You could make one with 4 2n7000 and one 2n3906 a Scottish diode six caps 11 resistors and L1 and program all the pic chips you want