Flora Danica should be fine; FD has Leuconostoc mesenteroides subsp. cremoris in addition to Lactococcus lactis subsp. lactis, Lactococcus lactis subsp. cremoris, Lactococcus lactis subsp. lactis biovar diacetylactis (which make up MM100). Strains and amounts of each may differ, but basically, you'll be good with just FD. It's tough to get many of the cultures here in NZ as not a lot of suppliers bring them in. CottageCrafts has a few, and I've had good service from them and delivery charges are minimal (I have no connection to them other than having bought stuff). Still, I often use buttermilk or yogurt that I get from the store and those will do (buttermilk is usually made with similar cultures as FD, but in different proportions and different strains, so it's not identical, but it works).
The mould should be fine for 10-11 makes. I use a similar one for mine of that size.
To reduce your fat content, you could let the cream come to the surface, then remove some of it (say, about half). You could use your removed cream to make butter, or a small batch of cream cheese (or just put it over strawberries or use in your coffee, etc). Look forward to hearing how it goes.