The trunk area of the 2010+ HB can actually accommodate a full size spare, the problem becomes that the foam insert holding the tools will not be resting on the floor of the trunk area but instead on the tire itself. This can cause a very annoying sound as it rubs and shifts during normal driving.
To fix this I added wooden block under the foam, attached with nails pounded half way into the blocks so that they would stick into the foam and old the blocks in place, I also used glue to further keep things from shifting. The blocks must be just hight enough so that the level of the top of the foam insert is just about even with the level of your spare tire. This way when the carpet section is placed over the tool holder it will rest on both the tool holder and spare tire in the center and will not shift up/down when loads are placed on the edges of the compartment.
The chief advantage is that you get a fully functional and stable trunk floor with a full size spare below it without any annoying noises during normal driving. Having a full sized spare is a far safer option should you end up needing it when out on the interstate, the stock doughnut is just not cut out for freeway driving and in rain/snow it is especially dangerous to use.
This is the foam insert upside down with the wooden blocks placed appropriately
This is a closeup of the full size spare in its compartment
This is the trunk area with the carpet placed over the tool holder and spare tire
This shows the car jack compartment door clearing the floor
Something like this will likely also work for the sedan, but I don't have one to try it on.