This works with RH (Resourceful Hands) so the mod manager should work i think
For a manual download: Extract head folder into steamapps\common\White Knuckle\White Knuckle_Data\Mods\Cosmetics\Hands\
Launch game and enjoy To use different flags, use the ingame palette system (click the gear ingame for different styles :))
CURRENTLY HAS:
RAINBOW TRANSGENDER PANSEXUAL AROMANTIC ASEXUAL BISEXUAL GAY (MALE) LESBIAN NONBINARY HETEROSEXUAL ARO ACE