As many different solutions as there are opinions!
Some suggest some fiberglass mat and resin applied directly to the underside to strengthen it.
Others suggest a variety of support methods underneath
- Wooden pillar cut to height
- Cut/stacked pieces of dense foam
- etc.
Personally, I fall into the latter camp, but I used a can of expanding foam caulk/sealant (such as "Great Stuff"). I squirted a blob into a zip-lock bag (not a lot - it expands like crazy over time). I then stuffed the bag under the console and clipped it back in place. I suggest a heavy weight on top, or the expanding foam will pop the console off. Keep coming back to it every 10-20 mins and check on it/push it back down, until it sets. Then you can take it out and carve off the sides and edges and shape it to make sure it doesn't interfere with the brake handle etc.
If you do this, the stuff is NASTY - if it gets on your carpet or seats it's NOT coming off. So cover/protect everything well (including the console) beforehand. If you get any on your hands clean them off well before you touch anything in the car.