I think you may be somewhat underestimating the problems caused by a local switching regulator. There is a very good site that I took this diagram from - it shows the noise produced by a switching regulator operating at 280 kHz (4 times higher than yours): -
As you can see, switching noise is not contained just to those frequencies around the switchig frequency. So, the line filters you are considering are going to be pretty good at attenuating all the noise in the 100 kHz to over 10 MHz range.
However, you may still have problems above 10 MHz because the graphs you show don't specify that range. For this region, ferrite beads are generally accepted as good solutions but, they still have to be designed with care: -
And, if you cascaded two ferrite bead circuits you would get a significantly improved response: -
So, I think that 70 kHz may be the smaller end of the problem even though it appears to pose the biggest threat in terms of amplitude. I say this because if your product has some form of voltage regulator (and I know your input is AC) then, this by itself is likely to have sufficient rejection at 70 kHz to significantly reduce its effect.
All the great images above taken from this superb site.