My (out of town) take: doesn't matter how many engines you have going. If you can make 7%, use the 222ft/122ft minimums. If you can only make 2.5%, then you have to use the 1332ft minimum (as shown in the Missed Approach procedure text). Those gradients merely provide suitable obstacle clearance. How you achieve them on 1, 2, 3, or 4 engines is entirely up to you/you company.
"OCA/H" an odd way of saying DA/DH?