Windows 10: Can I upgrade from v1703 directly to the next new version?

Skipping Windows upgrade versions or builds has worked like a typical upgrade. Unless there is something unique to Windows 10 1803 it should work as it has in the past allowing the skipping of Windows versions or builds.
So you could upgrade from 7 > 10; 8 > 10; 1511 > 1803; 1607 > 1803; and 1703 > 1803.
If there are problems with the upgrade it is likely that there would have been problems with any upgrade and that can be troubleshooted.

 

I never installed v1709 but can I go through Windows Update regular procedures to upgrade to the next new version of Windows 10?

:)

 

Can I upgrade directly from version 1607 to the Fall Creators Update?

Have you tried method 2 in Upgrade to Windows 10 Fall Creators update using these options - Your Windows Guide

If that doesn't work, I suggest that you start your own question as you're unlikely to get a response here.

 

Can I upgrade directly from version 1607 to the Fall Creators Update?

Updates are cumulative, so they include every previous update that your computer needs and lacks. There are some individual updates that your computer may not receive if the telemetry from your computer indicates that certain hardware is not compatible.

 

Should be able to, I've done a few Upgrades from Version 1607 directly to Version 1709 using both the offer from the built-in Windows Update and the MCT/Media Creation Tool process. Both types did not need Version 1703 installed first.