If initface can connect, then in multifun player you can add that connection using the buttplug.io protocol.
You will need to map each axis yourself. This can look like this:
(note that in my example i connected the edge2 and handy both in initface)
It might need to have an active connection (use the playbutton to connect MFP to initface), and then once set up the devices should sync.
You might have to adjust the fixed/polled update setting on the devices though (especialy for the handy), but usualy the default works fine.