Industrial Foregoing Version: industrialforegoing-1.12.2-1.10.1-175
TeslaCoreLib Version: tesla-core-lib-1.12-1.0.13

When you shift click an item into a black hole controller containing black hole units with 0 items inside, but items in the output port, the items get inserted into the black hole unit and get converted to the item that is in the output port. Essentially you can convert any item to any other item this way.

/edit: maybe filter the input slot to only accept the item in the output slot by default?