Could I replace the eggs with Aquafaba or flax eggs?

Hi! Since the eggs are one of only four ingredients here, it's hard to say how that substitution would turn out—but if you give it a go, please let us know what you think.

I imagine you could use whipped aqua faba to replace the eggs for leavening, yes. But the yolk of a regular egg is also bringing some fat with it, and as there is none used in the recipe otherwise, you may want to add in a tiny bit. Otherwise your cake could end up dry.