Can you run the HANA SL MC at 100 ohms?

 What is the internal resistance or source impedance of the Hana SL? 

Impedance: 30 ohms at 1Kz

30 ohms is pretty high for a cartridge of that output. At 100 ohms loading you’ll lose around 2.28 dB of signal in theory (relative to infinite ohms "no loading"; and about 1.65 dB down relative to the recommended 400 ohms loading, again in theory) and will start to induce some frequency response deviations from flat. But it will work, and only you can say whether you’ll like the effect.

As mulveling says, you will lose some output signal voltage at 100 ohms load, but also you will lose some extreme high frequency response.  The cartridge may sound a bit dull and rolled off with that load and a source impedance of 30 ohms, besides the penalty in over all gain.  However, it should be no big deal to change the load resistance afforded by your phono input, unless it uses an SUT to boost gain, in which case it gets a bit more complicated, but still not un-fixable.