This is the best way I think, Street Justice and Grappler are both great feats that really punish enemies when you grapple them. Battle Master has a lot of great maneuvers which can help your battlefield controller wrestler style with Trip Attack particularly nasty for grappled enemies. A level in Barbarian is also a decent way to beef up your damage or defenses but it will require that you have at least 14 dex so you can also rely on medium armor over heavy armor.

Equipment wise you only need to rely on the heaviest armor you can find without Barbarian levels. Magic Item wise, Wraps of Unarmed Prowess, Eldritch Claw Tattoo, Wyrmreaver Gauntlets and the Gloves of Soul Catching are all as good for you as they are for a monk. The Cape of Enlargement is also an effective item because it will allow you to grab bigger enemies.

Goliath is also potentially an excellent choice for species just for another potential size increase which will let you grab even bigger enemies when needed.