You can connect a Garmin or Wahoo device to your account, and any ride you do with that device will upload to Zwift and count towards your streak. Not sure what kind of riding you’ll be doing onboard, and whether you can get it onto a Garmin/Wahoo. If it’s just a spin bike you might have trouble.
But if you have a 12+ week streak at the moment, you’ll have a streak saver that will protect you from a one week gap. 24+ week streak means you have two streak savers.