Two major parts to this question!
Raising the stand may be the easier part as it is a personal choice for you to make. But the earthquake bracing? That can be a trick as it involved quite a number of factors like permission from the owners of the building as well as a sometimes political question involved simply having a tank. Tanks allowed so that asking about bracing for safety does not make for a worse situation? In that case, I would approach the correct people, stressing that you want to do the right thing to avoid any future disasters. From there it can go either way. They can find your thinking admirable or scuttle the whole idea of even marking a wall!
So moving to the "easy" part! For a temporary, I might look at a simple stand under the stand with the idea that it may look a bit different but passible. How far to carry the design to fit the appearance is one for you to decide. Are we speaking a great looking apartment where a significant other is involved or one where the gym socks make be hanging on the chair? Your call, there!!!
For simple, reasonably cheap and temporary. I would look at knocking together a 2X4 frame to elevate things, cover it with cheap fabric and go with it. For more class and better long term use, I would go with building a frame covered with plywood, etc. to match the existing and then go more effort to use molding to tie the two designs together more.