The chemist at Winsor and Newton says yes, water-soluble oil paints are as archival as normal oils. Apart from washing the brushes in just water, there is no difference. That's all I do. I wash the brushes in water. Also using the paints straight from the tube and in the final coats, an oil medium of 1/3 normal walnut oil to 2/3 Artisan Stand Oil.
For drawing the image on canvas, I use a yellow cadmium hue thinned with water. Expect the painted surface to remain tacky/sticky for a while after the paint has dried. This will stop after two or three months. Read Sean Dye's book
"Painting with Water Soluble Paints".
The Artisan Stand Oil adds back strength to the paint film, while the walnut oil thins the thick oil to a usable state. Use sparingly, in the finishing coats.
Good Luck,
Khaimraj