[Kheiron]

Unfortunately, I will not be able to paste anything like that here due to overly-protective company security policies.

But to answer your question, the reason we're moving back is simple:
The client upgraded from R55 to R60 on a new appliance about 2 months ago.
They still have the licence for the R55 machine though as they are planning on using it temporarily (for a week or two) while they move the R60 machine to a new premises.

However, the rulebase has changed significantly since the upgrade and now the two machines are grossly out of sync. So in order for them to remove the R60 machine, the R55 machine has to have an identical rulebase.
I was trying to avoid having to manually go through every rule but it seems that's unavoidable.

Thanks anyway. But if anybody else has a suggestion, I'd really appreciate it.