The glyphs in 3 evidences are slightly different, although they can be unified. Is there any rationale to choose the glyph in the evidence 1? If the glyph is taken from 慧琳一切經音義, the glyph in 高麗藏本 was same with the proposed glyph?

Whenever in doubt, we basically takes the representative glyph from Taisho unless there seems to be a clear deficit.

The 高麗藏 glyph looks as below:

[SAT-09752]恌 is not a commonly used phrase that we can't find it in the other books, and the glyph of [SAT-09752] is quite unstable, we need more evidences to confirm its glyph shape.

The character is probably related to 謟, as a headword 謟恌 is seen in 可洪音義:

https://commons.wikimedia.org/w/index.php?title=File:CADAL02019424_%E6%96%B0%E9%9B%86%E8%97%8F%E7%B6%93%E9%9F%B3%E7%BE%A9%E9%9A%A8%E5%87%BD%E9%8C%84%EF%BC%88%E4%BA%94%EF%BC%89.djvu&page=79