Well, the Cass County LEOs have stated their intent: Which is to issue a citation to you if you openly carry as you have proposed.
Seems like the simplest solution is to buy a different holster which is clearly OWB.
If you don't want to change holsters on principle or whatever, then you run the risk of all the things you've already mentioned: confiscation, attorney's fees. Plus risk of fine(s) and/or jail time, probation, criminal record, firearms violation. (Not being able to obtain a CHP for 10 years.) All that and maybe more.
Of course, we always have this consolation from the Nebraska State Constitution:
All persons are by nature free and independent, and have certain inherent and inalienable rights; among these are life, liberty, the pursuit of happiness, and the right to keep and bear arms for security or defense of self, family, home, and others, and for lawful common defense, hunting, recreational use, and all other lawful purposes, and such rights shall not be denied or infringed by the state or any subdivision thereof. [/b][/color]
Such as Cass County.
Good luck in whatever you do. And please be reminded that OC in Omaha requires something called the Handgun Identification Card (Open Carry Permit).