With correct modifier assignments this two in combination (mapped to one button) should do the trick
There is a built in modifier for that stuff: Add In > Remix Deck > Direct Mapping > Cell Delete Modifier
Map this mod to one of unused buttons on your controller and use it as a Shift type of feature (hold mod + hit cell trigger = unload cell)
As for copying samples from slot in to other slot you can use this command: Add In > Remix Deck > Legacy > Slot copy from Slot
This one I can't remember how it is supposed to be set. I need to check this and get back to you later.
Cheers,
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