Well, not really following your question or the answer given. There is no oil supplied to any part of the TA by the hydraulic pump or any other oil pump. It is merely slung up by the gears and run down a trough . If you mean plugging all oil drains and inlets between the rear section and clutch housing, the oil will still escape through the rear of the planetary gear transmission input shaft so planetary would run dry in short order.
But, no need to plug anything. Just put a plate where hydraulic pump was mounted and good to go. Also, realize the return from hydraulics does lubricate differential and bull pinions but for low run time pulling that would not be a problem.