Looks very complex please check with BMC Support team if they have created this product to handle such scenarios.
I did go though something similar with BMC support some years' ago (although I can't find the details) and the answer was basically that AFT/FW is limited by the underlying SSH framework in what it can do in these scenarios. I just wondered if any bright spark (i.e. you and the guys/girls on here) had found a way to do this.
In the end I have gone with rsync and that works well -
/usr/bin/rsync -crvz -e ssh /home/ctrlm-medxfera/DBShlp_UA/ ctrlm-medxfera@lbecs71:/home/ctrlm-medxfera/DBShlp_UA/