You can reinforce durasteel to stop a lightsaber but if you hold them together the durasteel's gonna break. Rememper Ep 1 on the Trade Federation ship when Qui Gon was drilling through the blast doors?
Vibroweapons were not inherently lightsaber proof. A vibroweapon is literally a normal weapon with a sonic generator attached to it. If you had a sonic generator, you could literally take your kitchen knife and turn it into a vibroknife.
The vibroblades could have been made special. It's a very possible possibility. But a vibroweapon in the most basic way is not lightsaber proof. Hell, you could make a wooden vibroknife.
as a light saber is plasma held in by a force field running the right electric current through any metal weapon would have the same effect as a light saber hitting a ray shield. it would either be stopped and not allowed further or it would bounce off.
Functionally, a lightsaber and energy sword are nearly identical; they're both plasma streams shaped and contained by an electromagnetic envelope. Realistically, simply moving the weapon could cause the blade to lose cohesion because the electromagnetic envelope is moving through a changing magnetic field (planet and nearby machinery and whatever).
try phrik