What’s the best way to bridge BTC to WBTC not using a CEX?

I have some BTC in a wallet, want to put it on AAVE AVAX chain. I need to swap it to WBTC so I can bridge that to the AVAX version using the Avalanche bridge.

But I can't find a good way to bridge my BTC to WBTC. The exchanges charge too much to withdraw to use them. Surely there is a way to not have to do that?