From some of the videos I've seen on YT (by manufacturers with software to remove it) there is a characteristic to that when active
it only allows very limited functions (for safety) like defrost for example but only on high setting etc. So, even if it accepted your coding, you would only
have very limited functions , if any, in the function capabilities of this module.
Also, dealers can be very different , from dealer to dealer, IF you show up with your own module and it is a different part number , they may or may not get involved - especially if the correct (to your car) PN is available. So, heads up Rob, I would call the dealer first and speak to the service manager before you go on a potential wild goose chase.
I think you have learned a great deal about in this process ; but the is the problem here as your new module is not original to the car.
Also, the software and hardware like Abrites, etc. who do address this very issue would not spend all the effort if had a work-around. Abrites for example (better be sitting down for this) costs , just for removal (ie sourcing used parts and then adapting them to another vehicle) $1500.00 for hardware and $4000.00 for software AND $350.00/year for Mandatory updates!!! If you skip a year...... its double the next time you renew! Remember, that software is only for removal for modules , clusters, etc. ; its not for keys, or engine 's . I don't think these products would exist if you could simply "recode" used parts and use them....... right?
If you find a dealer who will cooperate with you, it would only be around $150.00 usd.
Here is a company in the UK who I have spoken with several years ago on this very topic , they are retrofitters and it is quite common in the UK because they have access to the Audi servers (laws are different there regarding access) chat with them if you really want to get into it!
Audi retrofits online from HazzyDayz. We stock a range of Audi accessories & aftermarket parts. We specialise in Audi electrics & fault diagnostics.
www.hazzydayz.com