You could put a relatively large cap in series with the resistor to ground at the inverting input of the output amp. This will reduce the output offset to more or less just that of the input- which if the impedances are correct will be less than 1mv . The cap has to be non-polar, but it has a signal across it which is both very low frequency and very small, so distortion is extremely small and inconsequential and ONLY at frequencies close to the -3dB point and their harmonics/intermod products. If you really wanted to you could shunt it with smaller value "better quality" caps. If the resistor is 390 ohms, then a 47u cap will give a -3dB point at 6.5Hz, a 22u at about 15Hz, etc. The feedback amp I previously added only has the advantage of requiring a smaller cap and providing a "true" DC coupled design. Personally, I don't think it matters, but some do.