Excellent set of instructions from the OP.
I use Linux most of the time, Ubuntu 16.04, but I have Windows 10 on dual boot just for playing games.
I decided to try Playonlinux for the first time and see if I could get this going in Linux. The game threw some errors on install, but the base game got through the opening movie to the intro screen. I couldn't get CO8 to work until I installed a run time version of Java to the file. Then the CO8 front end ran but crashed before completing the install. I have a feeling that this could be made to work if I discarded the playonlinux front end and started from scratch with Wine alone.
Over to Windows 10, the base game installs with no errors. I tried to install CO8 but hit a wall when it comes to Java. Apparently Google Chrome, Microsoft Edge and, I think Firefox browsers don't support Java because of security issues. The exe inside the CO8 folder took me to a Java install page, but I couldn't install that on Windows 10 because the install script terminated with errors. Finally I decided to try to find a Windows 10 version of openjdk (Java used on Linux systems), that installed OK. Then it was the usual Windows convolutions to get the desktop runtime version avaialable in the right places(!). Finally I got the front end of CO8 running and the mod installed. The newly patched game loaded up OK but no keyboard and mouse, I had to <ctrl> <alt> <delete> out of that. Temple + installs really quickly on you c drive and puts shortcuts on your start menu to the config file and the game start (which is really nice if c drive doesn't happen to be a small ssd, with most of the data and applications living on d drive <grin>) Anyway, this mod opens the game up really quickly and the keyboard and mouse work too!