Yes, you need to add a bashplate and a proper crashbar (not the OEM option) and some bigger footpegs.
But on this training i went down after a jump (never enter on a angle
) and the instructor was impressed about how crashproof it was.
But back to the tyres:
I think Honda wouldn't put tyres on the bike witch are not compatible.
If you really want to be sure to have a good tyre you should find out what tyres are available in Germany for the CT. Over there the tyres need to be homologised for every bike and you're not allowed to run a tyre witch is not on the list.