I still have 2 Months warranty but if IceTea or whatever got spilled on the keyboard apple wont fix it for me unless i pay for it ( so no warranty will apply i guess).
Bring it to Apple and have them take a look?
If the key is sticky because of a spill, then you’re right that it won’t be covered under warranty. But you don’t know if that’s what happened.
You need a hub/dock that supports Thunderbolt.
Here’s one from OWC if you want to stick with them: https://www.owc.com/solutions/thunderbolt-hub