Why not make a fresh install with OMV3?
Your data should be safe, if you are not doing a mistake 
Have a look here
Not settings. Data should be fine.
As usual disconnect data disks and proceed with installation with a single os disk and the iso.
would it be practical
Nope.
if not I would be interested in knowing why.
Would you install Windows XP and incrementally upgrade to Windows 10? The 0.5->1.x->2.x->3.x upgrade works (I've done it once) if you are a skilled Linux user but there is always cruft and weirdness leftover. That upgrade is also a Debian 6.x->7.x->8.x upgrade and a conversion from sysvinit to systemd. Even if you start at 2.x, we recommend a fresh install to go to 3.x since it is such a big change.
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