Last time we spoke about girls easy to get all maxed and I said 6* Alstroemeria. But actually, there are two more girls: Kugaisou and Knot Weed. We can purchase 4 of them for 90 FG each (360 for 4 copies). Sure that's a lot of FG. But it's still cheaper than doing 3 times 77 rolls on reissue+bloom gacha for 3 dressbloom.
And they are pretty solid girls. Especially Kugaisou. She worth the effort.

Obviously some girls are far better and deserve High ampules and Centies more but thoses girls are still an option to get all the commender titles.
(now we need centies back as gacha rewards)