marmistrz: regarding dh_python, it seems to help with packaging and allowing bytecode for each supported version of python to be created at install time. As python-central has been depreciated since at least Thu, 14 Apr 2011, it might be worth investigating at some stage in future as it will make porting much easier.
https://wiki.debian.org/Python/FAQ#W..._dh_python3.3F (also has transistion links for python-central and python-support)
https://wiki.debian.org/Python/TransitionToDHPython2 (more general)

Anyway, I have found the last 2.5 release of python-default and tweaked to swap its 2.6 support for 2.7. python-central 0.6.17 port done as well. THESE ARE *NOT* TESTED!! I'm at the wrong machine to be running any tests at the moment, but I thought I'd post here so anyone can review the source to see if I've done anything stupid in the process.
https://www.dropbox.com/sh/x47qm8nxj...pBPMQ5i_a?dl=0