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Not to leap-frog a reply from Virgil, Michele, but a "final varnish" has a function above whatever integrity the paint films that comprise the painting may have, and that is to be a removable barrier between the painting and subsequent wear and tear.
As for the question of whether alkyds yellow, you can quite easily test the materials you are using. Apply a film of alkyd medium to a small piece of glass . . . make a few. Place one outside in full weather, another where it gets a lot of sun in an interior setting, and a third someplace where it's dark and damp. Within a few weeks, differences will begin to show if the material is "fragile". If it's tough stuff, it may take a few months to see changes.
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