Of course your flow won’t fail with a OSR
You just have to get it off quickly the same as people with traditional supers
And the honey will need processing afterwards. You can’t just jar it.
The most common mistake I see is that new beekeepers who have started with a flow hive are so excited by it all they put their supers on too soon.
You sound as if you’ve taken lessons in keeping bees so you know the basics of management so off you go and good luck
I bet you will find somebody to mentor you through from your local association even if it’s just through being nosey rather than altruistic
By the way. Have you got much OSR near you?
If you have heather you might find that more of a problem