The when locking all the interactions except the remove item, doesn't work. You can't remove any items the armor stand has.

For example, this should only allow to remove the sword, but it doesn't:

/summon armor_stand ~ ~ ~ {HandItems:[{id:"iron_sword",Count:1b},{}],DisabledSlots:2039582}

It might be related with the replace option. Here the only disabled option ins the replace item from the hand, and still doesn't work:

/summon armor_stand ~ ~ ~ {HandItems:[{id:"iron_sword",Count:1b},{}],DisabledSlots:1974046}