I am a Nintendo Switch player which I can't trade or receive platinum from other consoles.
So what do I do there because if I did what you said to do I am going to just end up angering others because they won't be able to buy something from me due the restrictions for Switch players.
I think a good fix for this would be to put a toggle in Warframe.market that tells everyone you have Cross-save enabled along with a toggle that only let's your stuff show to others who also have cross-save on the same console for the Nintendo Switch players.
That or DE should try harder to get Nintendo to agree to let us trade platinum with other platforms at very least even if they don't let it be shared between the same account.