just tiling around the comode and caulking in or grouting in instead of removing the comodes.
To remove the heavy comodes you have to turn off the water, carefully remove the water supply, drain the comode in both sections of water, remove the bolts which are probably rusted on, remove the comode, then clean out the old wax ring, install a new wax ring, and then install the new bolts and then reinstall the comode and go backwards.
Be sure and put a rag into the pipe hole, the sewer gases are terrible, then remember to take the rag out.
I would not do this by any means unless you know what your are doing. So many people also tighten the comode down wrong and break the fragile base also. This could cost you another $120 for a comode then installation is another $80.