Ridding unpredictable predictable interface names

Dear CFEngineer,
Predictable interface names tend to break my policies. Therefore I decided 
to fall back to old style interface names eth0 ... ethn, enforced in the 
files
10-persistent-eth1.link 
11-persistent-eth2.link
In the files the interface names are being paired with MAC Addresses.

The KVM (virtual) machines that I am managing with CFEngine have varying 
interface configurations, depending on their roles. A nameserver has an 
eth1 and an eth2, whereas an Internet facing machine has eth0, eth1 and 
eth2 and a cloud management node has eth1, eth2 and eth5.

I provide the interface names through the role definition and I extract the 
MAC Adresses from the output of the 'ip link' command.

In order to create the persistent link files, I need to pass the pairs of 
information to a template editing bundle.

I have two lists that I want to pair, like this:
macs slist => { '52:54:00:64:0d:0c', '52:54:00:64:0d:0d ' };
Interfaces slist => { 'eth1', 'eth2' }; 
I want an array or container like this: 
persistent[eth1] string => '52:54:00:64:0d:0c';
persistent[eth2] string => '52:54:00:64:0d:0d';
I looked over the functions again and again but I do not get it right.
How do I pair those into an array?

Regards,
Martin.

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