Kalanchoe (2nd Scene) and Pitahaya (Halloween) have been recorded by a fellow Discord user and uploaded by me.

Here's an updated list:

Missing H-Scenes:
6*:
Apple (Tanabata)
Susuki Grass (Swimsuit)
Sarcandra (Xmas)
Dusty Miller (Xmas)
Lavender (Valentine)
Edelweiss (New Year)
Stock
Reeves Spirea *No Dialogue*
Nightmaher *No Dialogue*

5*:
[Code]Bergenia (Gothic Maid)
[Code]Chloranthus Japonicus
[Code]Devil's Claw
[Code]Lindernia
[Code]Xanthium
Calceolaria [Done by Discord user]
Madagascar Periwinkle
Heliotrope (Yukata)
Ghost Weed (Xmas)
Mint (Maturing)
Hop (Hot Spring Yukata)
Snapdragon (Valentine)
Larkspur [Done by Discord user]
Turnip
Azalea (Newcomer) *No Dialogue*
Fritillaria (New Year)
Formosan Cherry
Chinese Quince *No Dialogue*
Lion's Ear
Gajumaru
Clover
Evening Primrose (Easter) *No Dialogue*
Hare's Ear *No Dialogue*
Easter Lily *No Dialogue*

3*/4*:
Blue-eyed Grass *No Dialogue*
Water Fringe *No Dialogue*

Missing 2nd Affection Scenes:
5*:
Fireweed [Done by Discord user]
Barrenwort
Wax Tree

Missing CSQ:
Mountain Lily
Lunaria [Done by Discord user]
Gerbera [Done by Discord user]
Black Baccara
Mimosa
Cattleya
Alpinia
Pumpkin
Mei Plumblossom
Lagurus [Done by Discord user]