Hi Michael, well, to say the least this has been a fun search! I enjoy helping folks when I can... kinda pay it forward, so many have helped me.
Found! Yes, confirmed with Newport Cemetery Commission that West Derby Cemetery is now part of East Main Street as stated by someone earlier Newport annexed West Derby about 1917. To make it easier in the future I will request Find A Grave to add an AKA.
Pictures taken today and are being snail mailed to me as the person does not do computer!! I promise to post them on the Memorial at Find A Grave and you are free to use... no copyright by myself or photographer in Vermont.
Joshua is in Plot 78 A with some other folks. Bethia (Church) Greenleaf is with him and there are four other stones that are hard to read.
Oh, I also found his son Abiah & wife Eugenah on Find A Grave... link requested.