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IVC102: Component choice for pA range switched integrator design

Part Number: IVC102

Tool/software:

Hello, 

following my previous thread, In my application I would like to replace the IVC102 with a discrete solution (op amp + analog switch + lower value cap). 

Which part numbers (opamp and switch) does TI suggest to achieve o comparable (or even lower) total input bias current? I would like to increase, with improved component choices, the sensitivity in the 1 pA range, or so.

I think the analog switch could even be achieved with a femtoampere-leakage diode...

Thank you,

DP