"Is this model tractor even available with a factory rear remote?"
www.tractordata.com
Hydraulic section says
From the info presented so far, looks like it may be time to "count the hoses" - as in, is it 6 or 7... (hoping it's 7, being that it's usually easier to find a place for a tank return than looking for a non-existent PB port)
If you "get lucky", I'd recommend putting together your own version of a "stack" valve, you can spec those with as many sections/types as you want. Individual sections can be spring return or detent, with or without float, motor control, solenoid controlled, etc - several years ago I got mine from Surplus Center. You pick an input module, output module, ANY COMBO of intermediate sections, the right length bolts, rig up a comfortable mount location, etc - Plus, if you plan ahead some you can put different types of sections IN WHATEVER ORDER YOU WANT (Ergonomics can be your best friend, or your worst enemy)
Personally, I would NEVER do this without AT LEAST one extra section.
Check out the Prince SV options here
Warehouse distributor for many top name manufacturers. Parker Hydraulics, Hypro Pumps, Prince Hydraulics. Direct from the factory. Surplus equipment. We buy large quantities of manufacturer's surplus or excess stock.
www.surpluscenter.com
Good luck... Steve