Just ignore the spare. Carry a can of Slime and one of their small compressors. Many cars come without spares now days, they may have run flat tires or something to repair the tire.
That slime can ruin a TPMS sensor ($$$) plus all the cleaning up afterwards. That's if it works in the first place. Get a nail close to the sidewall and the tire places won't even repair it, replacement only.
This can/compressor chit is just stupid. A vehicle needs a spare, even if just a doughnut. Get a flat on a Sunday, away from the city, or on a road trip, and it will be a bad, wasted day. Not to mention the expense. I've gotten a flat, just a few years ago, without a spare, would have meant a motel room for the night (happened on a Sunday, nothing open), a nice tow charge, missing work, and two days of my life wasted.
Thank goodness for the spare in the trunk.
We are making advancements with safety and other things, and stupid chit like this is a major step backwards. Ford and VW lost a sale with me over this. The Golf R and Focus RS both come with a compressor and goo, no spare. No spare for 40k? Keep it then, don't need it.