Is your suggestion for improvement related to a problem? Please describe.

Some unicode characters make problems, even with biblatex support (eg pdflatex still not completely supporting unicode). For example, Garcı́a gives

Package inputenc Error: Unicode character ́ (U+0301)

A few of such problematic characters are:

• U+0300: https://tex.stackexchange.com/questions/555086/package-inputenc-error-unicode-char-%cc%80-u300-inputenc-not-set-up-for-use-wit
• U+0301: see https://tex.stackexchange.com/questions/329239/how-to-solve-a-unicode-char-u301-error and https://tex.stackexchange.com/questions/443018/package-inputenc-error-unicode-char-%cc%81-u301inputenc?noredirect=1&lq=1
• U+2212: https://tex.stackexchange.com/questions/361019/unicode-error-in-inputenc-package

Describe the solution you'd like

As these characters are hard to recognize, it would be nice if there would be an integrity check warning about them, and an automatic cleanup to convert them to their unproblematic equivalents (e.g. 0131 + 0301 to 00ED).

Additional context
Might be helpful: https://github.com/zepinglee/citeproc-lua/blob/ab3ce712cc92073f12be26ff0b22b30eb906092d/citeproc/citeproc-latex-data.lua#L517