Speed dials created via feature code *75, where are they stored and are they visible in FreePBX?
The sqlite3 database /var/lib/asterisk/astdb.sqlite3
rasterisk -x ‘database show’
How would I properly remove those speed dials from astdb.sqlite3?
reasonably you need to do it within asterisk as although it is multi-threaded, it is not multiuser 
So from asterisk cli
database del <family> <key>
from bash
rasterisk -x 'database query “delete from . . . .” ’
use standard sql language to complete
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