JHCCoffee I don’t have an experience of an ARS pump, from a look on the internet it just looks another manufacturer of vibratory pump. I don’t see how this would be any different from a standard ULKA pump, or the OLAB silent pump you already have.
The silent pump does have slightly less power (35 vs 41W), but I’m not sure it makes much difference.
While I obviously can’t guarantee it, I can’t see how the dimmer mod could damage a vibe pump. The electricity is charging a coil which makes a magnet move and hence the attached piston. Should it destroy the pump (I can’t think how it could) its £69 for a new one (obviously you’d need to find one in Canada), so in the grand scheme of coffee paraphernalia it’s not that much.
If I was you I’d stop theorising and just give the dimmer mod a go. As long as you don’t drill your case it’s fully reversible. You could mock it up in a project box, obviously ensuring you take suitable precautions not to electrocute yourself. You should soon find out whether it works or not