Ti Seatpost for carbon rail saddle?

[spinarelli]

I bought a Brooks C13 carbon saddle on a whim, second hand. It turns out that most carbon rails are oval 7X9mm. My problem is that my Eriksen Sweetpost is only available with round 7mm rails. So is the moots seatpost.

I'm wondering if the enve seatpost clamping mechanism would fit in the Eriksen seatpost. Firefly seatpost is available with 10mm rails but I don't want to spend another $300 on a new post. Getting an enve clamp would be the cheapest if it would fit in the seatpost.

Curious if anyone else ran into this problem. Thanks!