Curious if you know the potential efficiency loss of converting back and forth from AC to DC and back to AC again? I assume a lot of energy is wasted in heat? Do clippers use so much energy that it may be cheaper in a short time to simply buy new clippers? $40 for conversion hardware already, it's only a few more bucks to get a decent set of clippers that match your new country's grid.
I didn’t study power electronics so I’m not in a position to confidently answer your first question however I’m sure if you do an online search you’ll find additional information addressing it. I found an article [0] that goes a bit more into depth, have a gander and see if it’s of any help.
For some odd reason, the popular hair clipper manufacturers, who are based in the USA/Canada, have a smaller selection of professional devices that they produce for the global market. So if you’re a barber in the UK for instance, you either have to wait for them to introduce a global variant of your desired clippers or you buy the cordless version if available. That’s why the conversion kit is a godsend if you find yourself in that situation.