Boxers? Lol, no way. Ray Mercer quit a kickboxing match simply because getting high kicked was just too much for him to deal with. Like straight up just called it a day after only one high kick. Boxers whole foot work, defense and distancing aren't made to deal with anything else than punches. And even then they can't deal with anything below their belly button with punches either. They don't have to worry about knees or low kicks when they clinch. They can just lean on each other with no real fear. Glory is also limited in their rules, but already a lot less. Make it Thai rules for maximum striking techniques, but take out throws and sweeps.