I am not familiar with the DX-Patrol up-converter but I assume that it is working as a linear converter. So what you would need is a relatively cheap step attenuator on thw input side of the converter to reduce the output power. This step attenuator only needs to be suitable for the input frequency and not for 2.4Ghz. I have seen those already for around 20 or 30 Euro.
The SG-Lab PA is very linear, even down to very low power, see my report at
Holger ‚Geri‘, DK8KW