FalconClaw has made a PFN640+ adapter for the flip-to-side mount. This allows you move the thermal device to the side, so you can use a red dot or LPVO sight without the thermal view. This is useful, for example, when looking through a window since thermals cannot see trough glass. You can also easily move the thermal device from your helmet to your rifle without any tools; it just locks into the mount.

This adapter is also compatible with regular dovetail interfaces, making it universal for mounting on both a bridge and the Wilcox flip-to-side mount.