Legal Question in Family Law in Missouri

You can use the alias that you described. However, you may still have problems with any official documents or records that are tied to your true name. They may not be compatible with other records using your alias. An example of this is Social Security records of payment and elgibility for payments. There are others. If it is the expense of having your name changed in court that drives your decision, only you can make the economic determination if it is worth the risk to just use the alias.

Good luck