Yes, the Vans sneakers have the same pattern constructions as a one cut Oxford shoes.
Because you want to make your own Vans sneakers from fabric use instructions from the first pattern construction of One cut Oxford shoes in the lesson “One cut Oxford shoes: How to make different Oxford shoes using one pattern 001”.
If you didn’t made a classic Oxford pattern before and will make your Vans from scratch, see how to do it in the lesson “One cut Oxford shoes: Another way to make one cut Oxford shoes 05” .
One cut Oxford have the same pattern construction so it will guide you to make your own vans.
When you will make a pattern of the upper with beading (as in your old Vans) use the pattern construction of upper from lesson “One cut Oxford shoes: Top line beading 09”
Regarding the shoe last that you have and want to make your vans with:
To change the height of last heel is not an easy task and it requires experience.
There are two ways to do it:
You need to saw your shoe last to change the angle and make your last lower or to build up the bottom with epoxy (bondo), as you said.
Both ways require precise calculations to make correct changes after you will change the height of your last to keep in the same proportions.
If you have few lasts and can allow yourself to ruin few of them, I mean until you will get the right result, make the changes with bondo. If you have only one example of this last I advise you to find the shoe last with the right height of the heel .
I have also another solution for you, how you can use the last that you have and make your own Vans sneakers . It is a creative solution that I always recommend to my students. Use what you already have and get out of the possible boundaries.
You can create invisible wedge heel. You will hide it under the upper of your Vans and then you’ll make the rubber shoe sole as you wanted.
As your shoe last has only 1″ height, so you need to create very small wedge heel, covered with the upper and nobody will notice it’s there.
See how it will look