Hi and Welcome to the Forum
I had this problem when trying to sequence a song and 'messed about' for ages, trying to insert a 2/4 bar in a 4/4 sequence. Unfortunately, I never found a satisfactory solution and just stuck with the 4/4 time all the way through the song.
Having thought about it again, you might be able to momentarily change to a 2/4 time signature, by storing a 2/4 style in one of the Panel Memories and switching to that Panel Memory for just the required amount of time - Messy!!
I haven't tried this but it might be worth experimenting. You could possibly use the Sequencer editor to make the change in the Control Track, post recording.
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Willum
After silence, that which comes nearest to expressing the inexpressible is Music.
Aldous Huxley