Frequency multiplier use

Would it be possible to upconvert a GFSK signal by passing it through a frequency multiplier like this one?
http://www.minicircuits.com/pdfs/SYK-2-33+.pdf
I'm mainly concerned with whether or not the signal will remain intact or if the frequency multiplier will distort it somehow.

Also, I'm guessing that a frequency multiplier is unidirectional? i.e., I can't run a higher frequency from the output into the input and expect to get a lower one?

Since GFSK is relatively constant envelope, it will work fine. Of course, the frequency deviation at the output will be twice what it was at the input, so you might need to reduce the input frequency deviation.

For GFSK, multiplier or divider will work fine. When you TX, you can multiplier. When you RX, you don't need divider, and you can handle it with DSP easily.

The FM modulation will double. Bandwidth with be twice as wide.

Ah, forgot about bandwidth doubling. What I really want is a transverter, but I haven't been able to find any monolithic transverter chips. So I guess that means I'll have to build a downconverter and an upconverter. Would using 2 ADRF6655's work for that?

Edit: Those things are expensive. I think instead I'll use a couple LT5560's and a single LO for both of them.