Not a specific item, but think about the actual use - to hear a single speaker 'on stage' as it were, to hear 2-3, that kind of thing.
What they had years ago was for a single person speaking to be amplified - they may have forgotten exactly what it was good for. Where they're in a group of people all talking at once, they might not benefit from an overhead with a wide pickup spread (but an overhead would be better than a lower level one - unless you're at a table, all they do is pick up feet and bags shuffling, although a table mic then leads to thoughts of murder where table and pencil tappers are concerned).
If you visualise the mic pick up pattern as a torch, what you had pointed out in a ^ shape towards the speaker, whereas a table mic is more like an upturned bowl light and an overhead is more like a lampshade.
Whilst it might sound tempting, don't bother with radio mics, as they usually get nicked, the transmitters get nicked or lost and often you get a low quality mic set that require batteries or chargers (both of which get nicked).
It's worth checking if they all have HAs with T settings - no point spending on a loop if they haven't got them, you'd be better off with a microphone, lead and a small guitar amplifier.
In fact, for five people needing a bit of amplification for a person speaking, I'd be inclined to say that's all you need - which would be a guitar practice amp, an XLR - Jack lead, a Shure SM58 and a microphone stand. Then you just plug in, turn the volume down, then switch on making sure the microphone isn't pointing towards the amplifier as you turn it up. Hundred quid (ish) for the 58, sixty ish for the amp, under fifty for stand and lead. And you can pack it all up in five minutes to take it home/lock it away from everybody else using the facility, so you don't end up with it being nicked or buggered up by idiots who fancy themselves as rappers.
Source - I might be enjoying the wonderful effects of a family genetic predisposition to deafness, but I used to be a sound engineer.