I think qtox is in pretty decent shape. I can't verify all of them, but it seems the majority are okay. Just browsing through here's a few I noticed that qtox fails:

2.2.6 A client may only transmit avatars with an aspect ratio of 1:1. If the user has chosen a non-square avatar, the client must transmit the square portion of the avatar displayed to the user. In the case that the user's client doesn't display avatars, the client must pad the avatar evenly on two sides with transparent rectangles, in order to create a square.

3.5.1 A client must encode emoticons as Unicode emoji.

4.0.2 If message persistence is enabled by default, all message logs stored on the device must be encrypted using the cryptography functions provided by the Tox API, or a comparably reputable, free and open source cryptography library.

3.5.1 is a really easy fix, delete "Basic," "Classic," "emojione," and "Universe" and rename "ASCII+emojione" to "emojione" and "ASCII+Universe" to "twemoji." The "ASCII+" emoticon packs, ironically and oddly enough, do not have any ASCII emotes so they should be ok. but they do have :emote: style emoticons.