Go talk to the authors.
Most times I have ever approached an author to say I'd like to borrow inspiration from their code, they're good with it and will often offer additional help and advice on top.
The flip side is, if you approach an author and say, "Hi, I plan to write an addon that does everything yours does, but better/more" then they may be less helpful.
You don't know until you ask though! Someone asked me that very question about a WoW Addon I had written and I had stopped playing, so was happy to just handover to them as that way it would at least get maintained.
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