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    there is no need to "build" a macro. You can simply append e.g. with \tl_put_right:Nn Commented Aug 24, 2022 at 19:24
  • it might be worthy learning the hook system of the latest few releases of the LaTeX kernel. I've found myself replacing 5 or 6 uses of etoolbox's \pretocmd-and-friends with \AddToHook Commented Aug 25, 2022 at 2:40
  • So many assignments :( Commented Aug 25, 2022 at 7:17
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    I kind of covered this (tricks to handle unbalanced token list in TeX, by putting something that x-expands to the desired token list) in tex.stackexchange.com/a/638453/250119, but maybe also see other answers under there. But "appending" a \ does require manipulating the whole thing as a string and \scantokens the result, it may be a better idea to learn how tokens work in TeX and manipulate the input as a token list directly instead of a string. ■ Side note, \tl_put_right:Nn in a loop has quadratic time complexity, use \tl_build_put_right:Nn etc. for performance. Commented Aug 26, 2022 at 0:11
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    A bit odd many people don't see the usefulness of this, while it's used in e.g. expl3 source code e.g. in \__regex_replacement_put:n to allow "appending" e.g. unbalanced { or } to a "token list". They think other people don't want to write complex macros? Commented Aug 26, 2022 at 0:21