Here's a quick edit which shows the factory loader valve, and then the setup with the new remote valve added. A two spool valve is not much more than a single, so I'd get a 2-spool valve and plug the ports until you need it. (Or if you don't mind, plumb it now!)
Factory loader valve:
View attachment 359940
New setup, your new lines are in color:
View attachment 359941
Note the green line tees to the existing black line, you can do this with simple pipe fittings. Or as I mentioned you can bring it to one of the two red-capped fill ports on the transmission/rear housing, however the rear one has a vent you'll need to replicate if you go that route.
Hope this helps.
ishiboo in your second drawing are your drain lines run to the port on the lower front of the hyd. block closest to the tractor oil pan ?
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