there are a few options i know of:
this which is a nice size, but expensive:
https://www.stereoping.com/wp-content/uploads/SC_faceplate_8000.jpg
using a behringer bcr2000, as detailed here (annoyingly big, and takes some effort, but works):
ctrlr:
there are probably others, but those were the best options i found as of several months ago. i ended up using a bcr2000. it's annoyingly big, but it works well.
also if you spend some time getting used to the interface of the actual synth, it's not as bad as it seems at first.