K man, what you are talking about is either a diverter valve or a true third function valve if you want to be able to control the
grapple from the joystick. You do have another option which is to use rear remotes. I used rear remotes on my CK20 and a diverter valve on my DK40se so I've had experience with both. I know the rear remote control location on the CK30 as it is essentially the same as on the CK20.
First, let me get my bias out on the table: Go with rear remotes. There are multiple uses for at least one set of rear remotes besides just operating a
grapple. A diverter or third function valve is essentially only useful for running a single hydraulic cylinder on a
grapple or 4n1 bucket. Secondly, a set of rear remotes (actually you should get two sets installed at the same time as labor would be identical) is cheaper and ultimately more reliable than electrically activated diverter/third function. Finally, if I had to do it over again I would be just as happy to have my DK40se
grapple operated by rear remotes. If you can drive a stick shift then you can operate a loader and
grapple with rear remotes.
Now to directly address your question. On my DK, the diverter valve is mounted to the inside of the right FEL arm. Hoses travel forward to the torque tube where they are mounted. Hoses enter the diverter from under the operator station by traveling up the FEL mount post. Works fine. Doesn't look great.
If you used rear remotes instead, you would run two 3/8" hoses (about 17-18feet long as I recall) from your rear remotes (which would be mounted just above your topping lift to one side or the other) and then travel down, over the rear axle, under the operator station, up the FEL mount post and down the FEL arm to the torque tube where you could attach the lines permanently with a welded or bolted on mount or you could just ziptie them to the torque tube. I did the latter on my CK.
Regarding the skidsteer attachment plate, those are pretty much standard. The Kioti SSQA adapter on your loader will work with pretty much any SSQA implement. There are some minor differences in sizing that rarely require a shim or grinding to overcome but those incompatibilities are pretty uncommon and easy to fix.