Setup with 3 handlers, 3 in the stack at the back of the end zone and 1 iso in the middle of the end zone.
DISC IS IN THE MIDDLE OF THE FIELD. 1 is the primary cutter, and makes a first move to the open side.
If that's not open, they cut hard back towards the handler.
If the iso doesn't get free, reset the disc.
Note: if you're going to do this reset in particular (backwards pass to the open side), make it a give-go. You become the primary as soon as the disc is on that sideline, so get moving!
Otherwise, follow the standard open side dump structure, and wait for the dump to make their cut - e.g. to the break side.
DISC IS ON THE SIDELINE. The primary cut should come from the middle handler, to either score a goal or get the disc back towards the middle.
Same as the standard reset structure - make a decision whether to continue the down the line cut, or come back from the break throw.
If you continue the cut down the line and it's not on, the iso cutter fills.
And then the play continues as normal.
If the middle handler instead decides to cut back for the break throw reset...
... Then the disc is back in the middle, the iso is the primary once again, and can also look for a continuation to the breakside if it's on after the dump.
If at any stage an attacking player is being poached...
They should go to the break side.