Elroq spare wheel options

Hi, I’ve recently bought an Elroq 85 edition. Great so far, I knew when purchased that there is no spare wheel.

While it is the case that the supplied puncture Kit may be sufficient for certain situations it won’t be for all.

My car has different tyres sizes back and front and has the 21 inch wheel. Other than getting a spare of each size is there a space saver option?

Thanks Andrew