Yes, you must vote uniparty, or else peasant!
Except we're not talking about peasants, are we? What we're talking about is someone who chose to run in the Republican primary for the Republican nomination, won the nomination, get sent to Congress as a Republican...and then helps a Democrat get elected Speaker.
If you consider Republicans to just be part of the "uniparty", then you shouldn't deliberately mislead voters by running as a Republican.