Hi, a bit late in the game, but I'm new around these parts...
From what I know, a catch can (CC) is superfluous on a stock 1HZ engine. The oil vapours will harmlesly pass the intake manifold and burn as they should. Nothing to clog up.
If you would have an aftermarket turbo installed, especially with an intercooler, and/or an aftermarket EGR valve, things would get different, however. In this case the oily muck would settle in all manner of unwanted places and end up ruining your day. (E.g., I have an aftermarket EGR valve installed (needed for registration in Germany, before my time), and that might end up giving me trouble somewhere down the line. ...but I will be blocking & disconnecting the darn thing someday soon...).
Pressure issues caused by the CC seem a bit far fetched to me, logic-wise. After all, the inlet system simply does not need the pressure from the blown-by oil vapours, and that will constitute only a little fraction of the intake pressure anyway. So leaving it in place should cause no harm other than the need for a little maintenance every now&again.
Make sense to you?