Just wondering if there were any KE30's that were stock air con, if so would it be difficult to install an a/c unit

YES

There is a KE35 on Gumtree with factory A\C and there is a semi complete system on e\bay for sale asking $400 +.

To install around a day with no hang ups to some one who knows what they are doing.

My KE11 has AC. Sourced brackets, compressor and under dash control from Peter Robinson years ago. Love it, very cold. Not too much fiddling. Put a big aftermarket condenser up front and after installing components, had my AC guru install hoses, wiring and receiver/dryer for about $400. Well worth it as I just spent 4 years up in Cairns.

Not sure if any of that helps but finding the brackets is the key. Anything with a K engine and AC in wreckers means your half way there..