My (legal) husband and I had a small courthouse wedding ceremony, which was done entirely for practical reasons after my cancer diagnosis. Neither of us are as frum now as we were raised, but having a Jewish wedding ceremony and ketubah is very important to us. Is there any halachic reason why we couldn't now have a Jewish wedding ceremony?
There is no reason not to have a Jewish wedding. On the contrary! There is a strong reason to have one, in order to live according to halacha with a kosher wedding and ketuba.
Note that, in many European countries (e.g., Switzerland, France), it is forbidden to have a Jewish wedding without first having a civil wedding. As such, all Jews first have a small wedding ceremony in front of civil authorities, and soon after that the real Jewish wedding.
With best wishes for a beautiful kosher wedding. Mazal tov!
Actually, there is a reason not to have a Jewish wedding, although I hope it does not apply to you. If there is concern that there may eventually be a civil divorce, without a proper Get (Jewish divorce), then it is better that the original should not be binding according to Jewish Law. See Igros Moshe Even HaEzer I, Siman 74, where he argues on Rav Eliyahu Henkin, and in Even HaEzer II, Siman 19 he says the children from a subsequent marriage would be kosher.
(The question of whether a civil marriage needs a Jewish divorce is beyond the scope of this question)