Any proposal under which tabs/sections to put these two preferences?

Appearance, where else?

Change 78410 had a related patch set uploaded by Matmarex:
Remove "Misc" tab from Special:Preferences

https://gerrit.wikimedia.org/r/78410

On the list of extensions currently using this section, there are a few more than those mentioned on the patch comments. I think (hoping my grepping is not too stupid):

EducationProgram/EducationProgram.hooks.php
142: 'section' => 'misc/education',
150: 'section' => 'misc/education',
158: 'section' => 'misc/education',
166: 'section' => 'misc/education',

MoodBar/MoodBar.hooks.php
196: 'section' => 'misc/moodbar',

OnlineStatus/OnlineStatus.body.php
188: 'section' => 'misc',
195: 'section' => 'misc',

OnlineStatusBar/OnlineStatusBar.hooks.php
113: 'section' => 'misc/onlinestatus'
118: 'section' => 'misc/onlinestatus'
123: 'section' => 'misc/onlinestatus'
128: 'section' => 'misc/onlinestatus'
133: 'section' => 'misc/onlinestatus',
146: 'section' => 'misc/onlinestatus'

TocTree/TocTree.hooks.php
30: 'section' => 'misc/toctree',
36: 'section' => 'misc/toctree',

WikiLove/WikiLove.hooks.php
45: 'section' => 'misc/user-pages',

JsonData/JsonData.hooks.php
116: 'section' => 'misc/jsondata',

CategorySlideShow/CategorySlideShowHooks.php
40: 'section' => 'misc',

(Just a note, in case it's unclear: moving these two prefs in core to other sections will not in any way break the extensions; if the "Misc" tab won't be empty thanks to them, it will simply appear and work as before.)

Change 78410 merged by jenkins-bot:
Remove "Misc" tab from Special:Preferences

https://gerrit.wikimedia.org/r/78410

The tab is now gone from core and thus will be gone from wikis that don't use the listed extensions (including most Wikimedia ones), so I'm gonna close this bug.