OK lets try and summarise:
You have an existing spectrum analyser which covers 0 to 30khz.
You want to make a "frequency extender" so that it can be used in the range 30 to 500(?) khz.
You appear to be talking about generating SSB signals.
Your terminology is confusing the hell out of everybody including me!
OK, what I think you need to consider is what is known as a "direct conversion receiver".
In its usual form, this takes an SSB signal and converts it directly to baseband (audio).
What you need is direct conversion receiver with a wide baseband (0 to 30khz).
From the datasheet you posted, look at figure 13, and start from there.
The baseband phase shift circuits (fig 14) may be a bit of a challenge.
Does that help?
JimB