I think the Muay Thai clinch work is essential. Modern clinch skills have winnowed in sport boxing. Watch the old fights and boxers had them. Read the old books and you’ll see the old bare knuckle swings. Chops, swings, elbows, variegated punches for gloveless encounters and a handful of high-percentage throws that resemble what you see in Judo only geared to slam an opponent who is punching and grabbing you. In 1889, George LaBlanche lost on decision after he used a spinning back fist (“pivot punch,” still banned) to pole-axe an earlier Jack Dempsey.