How to escape square bracket in link custom display text?

[ariehen]

You could try some Unicode alternatives.

[[Link Name|⟬1⟭]]
[[Link Name|⧼1⧽]]
[[Link Name|⦕1⦖]]

Recommendations for new notation system

Picking up where @ariehen left off, here is a page showing various possibilities for brackets which come in pairs, aka having both an opening and closing bracket as you indicated you wanted. http://xahlee.info/comp/unicode_matching_brackets.html or Where the latter shows a multitude of various ways to gather such lists. In short, I think there should exist some pair of brackets which shouldn’t have any meaning within Obsidian besides the visual meaning you’ll give them. Some of the alterna…

List of all Unicode's open/close brackets

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If you find a set you like, you can use GitHub - manic/obsidian-wrap-with-shortcuts: Wrap selected text in custom tags with shortcuts. or Templater and set a hotkey for them.