Reducing effect of MOSFET parasitic capacitance with resistor in series with gate
The resistor on the gate would be fine, it will slow down your switching but that does not seem to be an issue for your design. 

Regarding the body, if this was an IC I’d advise strongly against it, but being a discrete transistor I don’t see much of an issue. The body node will move with the drive signal but it will keep the proper bias. 

However, you are not reducing the capacitances. What you are doing is introducing a zero in your response which should improve your phase margin. Inductors might also work. 

But, at 200MHz you will have signal coupling through the FET. The way these switches are normally put together is with three devices in a T configuration with the middle connecting to ground. You should consider using a set of AC-coupled diodes as switches. Less parasitic to worry about.