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What you are looking for is called "frequency doubler" schematic. Schematics can be found online or in the following books: "QRP Classics", "Solid State Design for the Radio ...
So I found an answer in the recent video on FesZ Electronics YouTube channel. As it turns out, you can make a decent AC current probe simply by winding several turns on a suitable ferrite core and ...
I stumbled upon an article HF Transmitting Transistors for QRP by Richard VK6TT which may contain the answer. The problem is that fT is actually a function of Ic. This circuit has quiescent current ...