Is there a Paper plugin...

I've FINALLY gotten around to setting up worlds to 1.21.1 with the velocity plugin, im using a Paper Lobby and two NPCs, one Vanilla, the other Fabric (Modded). Is there a plugin or some way to check in the MC player has mods so they CAN join Modded and if not spit out error not allowing them to connect? Or.... Am I STILL making this way more complicated lol.
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