I finally got around to trying this, and I'm having a bit of issues.
Skip to tick and record doesn't work for me at all. I've tried creating a VDM file through lawena and then using demobuddy to launch the demo and that doesn't work either. It doesn't skip, and it doesn't record. Just plays the demo normally.
The game is still using my class cfgs and disabling my viewmodels on non-melee weapons. Not sure how lawena prevented this, since there was a command called lockviewmodelson in the lawena cfg, but it doesn't work, so something else is keeping the viewmodels locked.
A future option I would like is to set a tick range to record. I don't want to have to check up on my demo seeing when it finishes, I want it to finish for me, like with lawena.