Using "in other words" before asking a question

The second sentence in the text below is puzzling me.

Do you think the process is complicated enough that users will need screenshots? In other words, could plain text instructions do the job?

Does this work? This sentence doesn't start as a question, but it ends that way. Should there be a colon instead of a comma?

Do you think the process is complicated enough that users will need screenshots? **In other words, could plain text instructions do the job?**

This grammatically correct. No further punctuations are necessary

in other words TFD an idiom

A phrase used to indicate that one is about to restate something in a different way, typically to clarify or simplify it.

This is sort of like a 2 part question, the second (after in other words) to emphasize and clarify the first. It can be used in a statement to.