Just add a wake command to your weapon thats based on the character’s (owner) moving speed.
When you attach/spawn it, you specifically set the owner.
From it, you can read some base values without casting, or you can cast and isvalid it to access more specific things.
Or, just disable the sleep value alltogether when you attach the item.
So long as you remeber to re-enable it to a standard value when the item is tossed/released, you should be good to go without hacking a container box around it…