If you really "won't ride a bike you can't flat foot", then I think you ought to pass on the C14.
As to my personal experience, I normally wear 32" inseam pants. Out of curiosity, I measure pants crotch to floor and came up w/ 31.25". I normally cannot flat-foot the bike w/o wiggling around on the front part of the seat, but it is easy to get the balls of both feet firmly on the ground, with the boot heels just hovering off the pavement.
Backing up is not particularly easy, but only becomes an issue if I'm trying to back uphill (even on slight grades). I have learned to be careful where I park. Sideways inclines can be a stopping/parking risk as well - I dropped the bike once on a slant on a cold, rainy day.
A lowered/shaved seat may help. Lowering the suspension is possible, but has side effects, which may or may not be of concern to you.
The C14 is a great bike, but it is also a big, tall, heavy bike. There are lots of very good bikes out there that weigh less and have lower seat heights. It might be worth checking them out before spending your money.
I think the C14 could work for you, but if the flat-foot thing is truly a no-go for you, well, you know.