Most of the time the problems will revolve around views, wizard.interface and the fact that res.partner.address is no more.  So, if your code does not touch res.partner.address and does not use wizard.interface (the alternative osv.osv_memory has been available since v6.0), most of the work will be in the views.

That solution presented in stackoverflow i did not try, so i dont know if it's that simple.

I am trying to migrate databases from 6.1 to 7 and then to odoo/8, and in my search i found two projects:
1) openupgrade(https://doc.therp.nl/openupgrade/): where you have an automated script to do that.
2) Anybox(OpenERP/Odoo migration framework): where you have a mapping file to identify the origin and target tables and columns.
I am also seeking experiences of others that had sucess doing migrations using one of them.
At this time, i am still trying to understand both, because the main problem is always related to dependencies/foreign keys from tables and modules that have changed or disappeared. And also problems with custom modules.

I dont know if this help you, but if you have sucess tell because i am still looking for a solution.