UDP and jetpack? I know how to get around losing UDP

Have 5 moto x on family plan, and all UDP, so now there is this new . fee added to UDP, only added to out of contract lines, all lines up for upgrade, I know I can upgrade and as long as I don't activate on upgraded line still keep UDP, so going to upgrade all lines to get into new 2 year contracts so the new fee is not added for at least two years. don't need 5 lines, if I order the the jetpack on line one and stick the sim from line two in the jetpack will the jetpack work? thanks