Have you thought about using Shutter Encoder.? Its free, and on my (very) occasional use I’ve had good success; it has an AV1 output codec too for impressive (small) file size whilst keeping a high quality image. Ideal for shuttling work back and forth, during a projects progress.
Good (very helpful) thread here, that includes a Cubase audio export ‘Post-process’ script:-
Audio Export Post Processing: Open Export Folder - Cubase - Steinberg Forums
This way you just forget rendering any video out of Cubase… 