The wire protocol of classic Tesla supercharging is custom, so it'd require electronic components, not just a physical adapter. It may be technically hard, e.g.

The wire protocol of classic Tesla supercharging is custom, so it'd require electronic components, not just a physical adapter. It may be technically hard, e.g. ChaDeMo and CCS speak a different wire protocol, and there are no adapters for them. However, when the charging station can use the CCS protocol, it's only a matter a of physical adapter. Tesla's "Magic Dock" is it.