>>jonwin+(OP)
There's a, community supported, Copilot LSP plugin for Sublime. It can be rough around the edges - but I tried it and it was enough to get me to buy a 1yr Copilot seat (at current pricing).
Completely understand if Copilot is enough to make people want to switch over - but for me it wasn't, and I don't feel like I'm missing out with this setup.