You can use a PinSub kit to get a 3.5mm audio out on the SPIKE2 board. Makes it easy moving game-to-game. If you want to get the audio over the HDMI, splice the end of an normal 3.5mm audio cable to a JST 4-pin connector and connect it from the PinSub to the LVDS board. (The audio pins on the Spike board output speaker-level audio, so you don’t want to connect it directly to the pins without the PinSub or something else to convert it to line-level)
I’ve had success capturing the 1366x768 with the regular CamLink and the Magewell Quad HDMI card. IIRC, my HD60S did not like it as is, but you can use an HDMI upscaler if you want to get a more agreeable resolution.