Below is just a suggestion but one which petestrash, thomson & Darren King may find useful.

Instead of creating a separate headend for each area, why not get users to configure the Palmod "Fine tuning" setting for each channel to the actual frequency for their specific area. What this would mean is that one headend could be used for all areas and it would list all the available OTA (Over the Air) channels. Aside from only one headend needing to be generated, the other main advantage of going this route is that you can assign channel numbers that don't conflict with existing numbers in the satellite lineup, this is very useful for users making use of two inputs. All that the user needs to do is configure the Palmod "Fine tuning" to adjust the channel number to their local frequency per each station.

The "RF Setup" page I created for South African users means I can generate one headend containing all available OTA stations and users can modify the channel to their local frequency while still maintaining the non-conflicting channel numbering. The "RF Setup" page makes the whole process very simple for users as all that is required is for them to enter in the local channel number after which the code to make all the changes is automatically generated.

Although the above works without hassle on a PAL modded US TiVo, I'm not familiar with how the ukchan module works and if it supports a "fine tuning" option as is available with palmod, I'll leave that up to thomson to answer. If the "fine tuning" option is not available, adding it may mean that new/custom modules don't need to continuously be created.

Any comments, good, bad or otherwise on going the above route are most welcome.