The list of compatible USB BT dongle list on a certain PS2 site proved useless, two of the ones I was able to source didnt detect at all.
https://www.ebay.com/itm/313636887111
this $4 generic China one did though (found a reddit thread of someone claiming not only this works, but is the only one of many they tested that pairs with multiple controllers for multiplayer with ease) for anyone on the search
There isnt much info out there or documentation for Pademu compatibility its a shame you have to go on a goose chase
https://www.ebay.com/itm/313636887111
this $4 generic China one did though (found a reddit thread of someone claiming not only this works, but is the only one of many they tested that pairs with multiple controllers for multiplayer with ease) for anyone on the search
There isnt much info out there or documentation for Pademu compatibility its a shame you have to go on a goose chase