For me what you are copying is what is explained on the normative of invoicing that I already linked on the first topic:
And this is also already answered on the first topic of the discussion.
So for me the main proposal to use journals for sequences is still valid but we need to split it into a separate module as we already discussed
For me we already have a clear path to go, we just need someone to work on it.
If you want to volunter yourself and have doubts about how to proceed, feel free to contact me or open another discuss here and we will be happy to help.