Hi Ryan,
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A couple of issues:
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1. 455 kHz doesn't lend itself well to? rejecting receiver images adequately. For AM BCB, it works OK, but the higher in frequency you go, the tougher it is to filter out the image frequency in your front end. Also the products (including the nearby LO)? from the TX mixer would be exceedingly difficult to filter out.
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2. Crystal filters for SSB would be next to impossible to design at 455 kHz for a umber of reasons (Lack of suitable crystals being the dominant factor) You'd have to consider mechanical filtering.
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It's got to be a superhet with a crystal filter. That's what I have as extra board blanks from the 40 meter transceiver project.? And anyway, I don't care for direct conversion or phasing SSB techniques.
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Steve
WA6ZFT
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hwstar