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My first grinder was a Zassenhaus, the sort of prismatic hourglass shape designed to be held between your legs.
Impressive output considering the age, but quite a bit of effort (though I was using it for espresso). If I were in the market for your use case, I'd be looking at the Rhino or the Wilfa Svart (or the Timemore, but I've got no direct experience with those). There's some excellent hand-grinders out there for much more money (let alone motorised), but while they're arguably a necessity for espresso, you can certainly get away with something like a Rhino/Porlex for filter coffee like a cafeterie. Though some grinders have issue with consistency when it comes to grinding that coarse so that's something to keep an eye out for.
Not at all a necessity, but the options that have a hex bit on top are a plus for sure. Means you can always slap a drill on there and hey presto, a motorised hand-grinder!
Thanks @Mr_Smyth and @mmccarthy, will look into these. We have an old wooden Zassenhaus which somehow has great reviews, but the metal lid section becomes buckled with use and this completely effects the grind, plus the ergonomics are horrific.
Want to buy once and have the ability to buy spares should something break/wear.