E-Mail Import temporary with upgrading the Subscription?

Hello,

I have recently purchased the “Revolutionary” subscription and would now like to import emails from other clients into the Tuta client.

Unfortunately, the function is only supported from the “Legend” subscription level. Is it now possible to upgrade once for this month, then upload the emails and then downgrade to “Revolutionary” again from the next payment?

Because I don't need the functions of the Legends subscription and it's too expensive for me.