Module E's and others from that period are relatively difficult to change tires on.

As far as "gumwalls", I think what you meant is "tan sidewall" tires in a "skinwall" configuration.

The reference to "gumwall" relates to the addition of thick rubber over the sidewalls, regardless of color. In the old days, it was real gum rubber, but today's gumwall tires are simply tan or black rubber that is somewhat similar to the rubber in the tread.

The Pasela is the last remaining, common (and low-priced) "tan-skin" sidewall tire.

Gumwalls like Cheng Shins are available in tan also, but have roughly a 150 gram weight penalty per tire along with a lower-density, more coarsely-woven casing which is heavier and typically offers poor puncture protection.
I do recommend the Cheng Shin gumwalls above most others for their sensible tread configuration, clean molding quality and overall quality-control at a still-modest price.

Note that gumwalls have outstanding sidewall protection against weathering and abrasion.