Extending the BW is probably theoretically achievable, though the extent required for the transceiver may not be simple (e.g., if its local oscillator is PLL synthesized, you have to hack the digital counter itself to even be able to reach those frequencies).
There is a fundamental limit to the bandwidth of any stage: for a given system impedance Zo, the shunt capacitance (e.g., transistor collector / drain capacitance) must be less than 1 / (2*pi*Zo*BW). This is true, more or less independently of the center frequency. If baseband (i.e., a "wideband" amplifier, where the low frequency cutoff is many times below the high frequency cutoff, or all the way to DC), then this sets the high frequency cutoff (in essence, the center frequency is 0). For a tuned amplifier, the center frequency can be arbitrarily high, but BW remains more or less constant, and therefore the BW% drops as center frequency rises. (So a transistor with some constant capacitance can do DC to, say, 50MHz, or 100-150MHz, or 500-550MHz, but only each range at a time, in a suitably designed circuit.)
Going from this theorem to actual circuit changes isn't simple. Inter-stage impedances are often higher (giving a better match to base/gate input impedances, and increasing gain, at the expense of bandwidth), or much much lower for power stages (big transistors require big currents..). Rather than carrying signals in transmission lines (of characteristic impedance), signals may be carried by coupling capacitors, transformers, matching networks or filters, all of which have a broad range of impedances (and component value interactions!).
If the circuit is quite simple, few of these may apply, and the change might be pretty simple. But it still won't be as easy as plugging in proportionally different inductor and capacitor values. So it's really hard to say.
Tim