Is there any Coupler adapter for this type of coupler?
Wow, interesting couplers! The best thing to do would be to remove, if possible, the existing couplers and draft gear boxes and then try to engineer a new mounting for whatever coupler you wish to install.
Of course, speak to your hobby shop staff. They may offer some tips. Not sure what you'll find on the Kadee or Micro-Trains websites.
Not much useful here, but I hope it helps.