Anyone find a suitable adaptor for this? could you please post a link to suitable units?
if your triggers are incapable to make a contact with a central pin then there are several options
1) use any standard hotshoe to standard hotshoe adapter that can make a contact with both your trigger and camera central pin - there are such adapters, that for example those that just add PC port... that might require trial&error - but they are very cheap
2) use old Minolta hotshoe to new Sony adapter and then there are adapters like you were looking for the old Minolta hotshoe
3) if you trigger has a port (PC, 2.5, 3.5, whatever) that can be used to fire it, then again adapter from #1 shall work as you do not need your trigger to have a contract with central pin on that adapter - you use it just to mount the trigger + small cable (from adapter to your trigger)
and if your triggers expect more just one central pin to be fired then I guess you have an issue