dropping it in place on some jack stands so it can be bolted right back up is 1 thing, and much easier than running over to the edge of the field, dropping it.. then going back to do the split, just so you can roll the front half forward instead of rolling the back half backward.
I just split a JD 2240 ( about the size of a 4000 ) to do a clutch and it has an 8' sweeper broom attachment on front. the subframe DOES hit the side of the tranny on each side.
I DID disconnect the bolts and leave it propped up, and then i rolled the back of the tractor waay..did the clutch and roleld it back and bolted everything together.
WAY WAY easier than dropping that front attachment completely so i had room to move forward.
I kinda see his loader setup working out the same way.
I'm just trying to think of the least amount of work for the OP..