> Indeed: that is the thinking.

Good!

> At the moment the focus needs to be on the current update.

By the way, did you integrate all of this:

https://github.com/lualatex/luatexbase/blob/master/luatexbase-regs.dtx#L266

? Should I make an update removing a few things (or everything)? Can the
LaTeX update and this code coexist?

Thank you,
-- 
Elie