Problem is the biggest determination in deflection at this point is the span - no, you can't remove that support, it is acting as a post.
Turning the brace, so to speak, would be a great option, if you could actually get it to take the load before failing the existing structure. I'm not sure how you can get the connections to be able to do that.
BiscuitSlayer has what is probably the best option, honestly - except if I am reading your OP right, it won't fit. If it were me, I'd be looking for a sump that fits inside the stand, and then installing it like Biscuit said to.