What's the most cost effective way to get BTC onto Polygon?

Hi guys. I have some bitcoin sitting on binance.US that I would like to move onto Polygon. Of course we don't have access to WBTC like the real Binance does.

I'm thinking the most cost effective way would be to sell the BTC into Matic and just go ahead and create that taxable event, and then buy it back over on Matic. Is there a better way? I do have a non-KYC Kucoin account that has WBTC, but they don't support sending it on the Matic network.

Any advice you can offer would be appreciated. Thanks!