Yeah. I've seen that the 12" cone is tagged as 60 W continuous power, 120 W peak. So the 2x12" should be 240 W peak. You won't be able to crank the Profiler all the way up with it, but as you say it will be a much safer territory
The danger practically remains tho, specially since the feeling of safety will possibly make your attention get loose. It all depends on how much volume you need.
Sadly, thats not quite right. The 16 ohm cone in the NL12 is indeed rated 60W "AES" .. which will handle 120W of music/programme so far so good.
The NL212 has two of them .. so yes, it handles 120W AES, or 240W music/programme ...
But ... the NL212 has an overall impedance of 8 Ohms, where as the NL12 has 16 ohms ... so while the maximum power of the Kemper is around 300W into 16 ohms ( about twice what the speaker can take) .. it is 600W into 8 ohms (again about twice what the speaker can take) so the situation is the same.
Really it makes a lot more sense to think of the amplifier as a VOLTAGE source, not a power source. You can consider the speaker cone has a maximum voltage it will be safe with, so if you connect 1 of them or 2 of them across the amplifer terminals, the volatage applied will be the same.
It would be great if the kemper had a "power level" control on the amplifer itself, allowing you to limit it to a certain level. They could even display it for both 8 and 16 ohms at the same time, which might help people understand that really you are setting the output voltage, not the output power.
So, at the end of all that ... if you keep the maximum output around -6dB, you will be fine. this should deliver around 75W into 16 ohms (150W into 8 ohms) ... after that, it depends on your playing style etc, you culd push it as far as -3dB and still be safe if you are playing fairly dynamic clean tones. Probably best to stick to around -6dB if you play "heavier" stuff.