We need to know what force map equipment do you want. There's a packet called ForceMapEquip which tells the client to show the forced equipment. Some maps have forced equipment like the old beginner tutorial map (the one with the apple suits). I'm pretty sure you'd have to edit the WZ files so the client will know what forced equipment to show.
If you want to actually force a certain equipment and not only show it but actually give stats, just give the player an equipped item?