None of the 5-sized Okuma reels will reliably produce enough drag for heavy-duty mechanical jigging. The drag itself is capable of producing that much pressure, but the pinion and left side spool bearings will suffer and make the reel feel yuck, if not initially but after some use. You can modify the reels to reliably produce more drag, but they are much much better suited to a combination of light or slowpitch jigging, which they do very well, and have some capacity in reserve if you do hook a Kingfish.
The only small overhead reel that has the grunt for mechanical jigging is the Maxel, in my opinion, or maybe the Jigging Masters as they are virtually identical, but I don't have first hand experience of them. The small Catch reels, Shimano, Daiwa are all light/slowpitch reels. The Catch reels make ****loads of very competent drag but IMO they're not structurally up to the level of drag they can produce and can't run the top end of the numbers reliably. Been a couple of years since I've tinkered with one so that may have changed, perhaps with the JGXs, but I remain slightly skeptical.
The best budget overhead mechanical jig reel by a country mile is the Shimano Torium 16PG, but they don't do it in left handed.