Last I checked, nixOS handles vm's quite fine. The idea is to recreate your rig on cunsulting client hardware. OP mention he prefers to work on client's supplied machine. In fact at that level of consultation, 2 machines should be provided, a daily driver laptop, and a workstation with a hypervisor. Therefore, having those configurations declaratively stored, would save some time. either thru ansible playbooks.. nixos, of course recently there is a third option.. a cli agent like claude code.