I don't want to download the iso myself, because it is to big and I don't need it. But the following should work.
Extract the UBCD ISO image to the harddisk (assume "c:\ubcd"
Extract the Vista Recovery Console iso to c:\vistaRC\
Extract the bootsector (make sure the file has a .bin extension) and put in the ISOLINUX folder.
Use BBEI http://www.nu2.nu/bbie/
to extract it and rename the bin file to vistarc.bin for example.
with a text editor:
MENU INCLUDE /menus/defaults.cfg
MENU LABEL ..
MENU LABEL Boot Windows PE 2.0 with Windows Recovery Environment (Vista)
If you want to run both the 32 and 64 bit version, you are probably out of luck because you have to hex edit some files, but bootmgr can't be hex edited because windows does a integrity check on it and it won't boot then.
Search google: "isolinux windows recovery console"