Can I clear my housing edit inv?

I may accidentally have opened a guild reward chest while in housing edit mode.
Now my housing edit inventory is full of un-IDed items which I can't store in any bank (neither block-bank nor character/account-bank), can't trade and can't drop (/itemlock has no effect as well).
But I also can't just keep them in the inventory, because it's filled to the brim and thus I can't build with this character anymore.
How do I get rid of them? I don't even care about the items anymore, I just want to clear the inventory.

Can anyone help pls? D: