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It looks like the charge current is the one parameter that can change with frequency that will allow the filter component values to stay similar from 200-400MHz. I need to ramp down the charge current to half as the frequency goes to half. I might try a FET as a variable resistor. Maybe an N-Channel Enhancement Type MOSFET actually, because its off at 0V and turns on with more positive voltage.

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Never mind. It looks like an an N-Channel Enhancement Type MOSFET as a variable resistor will only work well without much voltage difference between Source and Drain and there's no place in my existing circuit where I can easily do that.