Yes, it is possible to connect a Ledger device directly to Curve without using MetaMask. However, it is important to note that the process can be quite convoluted when using Chrome. For this reason, it is recommended to use Firefox instead, as it is much easier to set up. Additionally, it is important to make sure that you have the latest version of the Ledger Live app installed on your device before attempting to connect it to Curve. Once you have done this, you should be able to easily connect your Ledger device to Curve and begin using it.