Amplifying 40 - 80 uV with DC bias of at least 200 mV.

I am using the AD8428 in-amp and it is very sensitive to input resistance and hence the classical DC coupling as seen in the datasheet will not suffice because the thermal noise will become so high that it renders the signal undetectable. How can I get rid of this DC-bias without using a DC coupling with high-value resistors? Any ideas are greatly appreciated.

All the best.