Interesting. It is unfortunate that the ambiguity exists.
However, I think it reads a bit too much into the Bible to state that these women were non-wives. (I also note that most modern translators (including George Lamsa who is sometimes good for an outside viewpoint) translate “wives” and apparently don’t feel the need to mention the other possibility. Elsewhere in the New Testament we are admonished to abstain from the very appearance of evil. For the apostles to routinely go around with women who were not their wives would have opened them up to easy criticisms that would have brought a bad name to the Christian faith and Christ, in a time when there were many enemies who would not have hesitated to make use of such an opportunity.
Obviously, it’s possible for reasonable people to arrive at different conclusions.
On the contrary, it makes perfect sense. We tend to look at events through the lens of contemporary society. Clement of Alexandria agreed, saying the women were not the wives of the apostles but were female assistants who could enter the homes of women and could teach them there (Stromata III, 6).