Completing equations in Keynote using keyboard only

I'm making a Keynote presentation with a lot of equations. To add an equation, I can press option-CMD-E, and then I can type the LaTeX code for the equation. However, to complete editing the equation and insert it into the document, I have to move the mouse pointer to the "Insert" button and click it. My question is whether there is a way to do this using only the keyboard, so that I can enter equations into the text without using the trackpad at all. Here's what I've tried: * press enter (this just puts a newline in the LaTeX code) * all possible combinations of enter plus one or modifier keys (shift, ctrl, option, CMD) * attempting to select the "Insert" button using the tab key (but it doesn't do anything) Is there something else I could try? The same issue affects Pages as well.