@jay_s_uk You did a great job identifying the right place to customize the software (at least for me, it would have been a lot of work).
Anyways, considering that in this case I would need to host the whole programming environment for this minor change, which would not be persistent at the next release, I decided to rather try to create a macro and use the BtnCmd plugin to make it available in DWC.
Thanks for your help.