I mean, if we consider the ES politics and the Imperial - Weilu cultural factions, then I think it is fair to say that we have over time taken quite a few more weilu option than imperial options. In fact, I wouldnt be surprised if people considered us to be in the 'Weilu Moderates' camp at this point. (even if we ourselves might not think so)
The Meng are one of the oldest and (and likely) pro-Weilu clans, so arguably we kind of want to have a good relation to them since we have probably have quite a bit in common. So Meng Diu asking such a huge favour of us seems to be a good opportunity for us. Also, the Meng deciding to support her is arguably a success for CRX.
[X] Accept the offer, you can convince Renxiang and sponsorship from even a faction of a count house is a valuable thing.