Omnia 7 downgrade to original firmware after flashed custom rom?

I want to install a custom rom on my Samsung Omnia 7 to make it look like Windows Phone 7.8
I have already unlocked the boot (I can enter in "download mode") but... Can I install the custom rom and after, install 7.8 original firmware when it will be avilable (downgrading to 7.5 again with a backup)?

Sorry my bad english T.T

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