Right. The way HOFA does this is good. In the preferences, you determine what 3rd party dither plugin and settings you’d like to use for dithering when rendering 24 or 16-bit files, or DDP of course. This could allow for multiple format exports/renders at the same time, with the correct dither setting for each export.
WaveLab just doesn’t have this kind of logic built into the background. It must be a plugin running live at the end of the processing chain when the rendering process is started.
Something might be possible with the Batch Processor and Watch folders but that sounds like more of a headache than a solution, and doesn’t help with DDP.