No transformer actually works at such a high impedance level. Most stepups will have a specified preferred load, usually no more than 47K, which will optimize their treble response - a higher load impedance will expose a treble resonance in the transformer.
The specified inductance of the cartridge is 2mH, which gives a reactance of 186 ohms at 15kHz. That would then be the -3dB point. So a high load impedance is desirable (I'd say 1000 ohms instead of 47K, but they may have other reasons for their spec). It just can't be done with a transformer unless the stepup ratio is fairly small. At a guess, 10:1 or less is the best you can do with a transformer. If your transformer has other taps, I would certainly experiment with them first.
All that said, with a transformer connected the transformer's winding resistance provides the necessary grid bias on the first stage, and the 47K can be removed without harm. I'd suggest carefully unsoldering one end of the resistor and listening for an extended period, before re-soldering it for another extended listen. By then you will have a good idea of the effect in your system, with your music, and using your ears - the only ones that really count, after all. All this theory stuff is useful but it only takes you so far!
