My post was more of "a simple replacement to commercial UAT's" rather than having or not having a UAT/header.

On that I would feel having a header is still more reliable, as "empty" should still be a full header where as a turbine will majority of times stop before it fully empty's a conventional tank.
The landing weight of a full UAT is not an issue either as you will not empty a single tank setup in flight and will have a minimum of about 4-8ozs left anyway after each flight for the fear of a flame out.

There is no reason why a single tank with a good clunk should not be used and one of our guys P80 boomerang has been like that with nearlly 200 flights and no issues, but he does still always land with sufficent fuel in the tank.

I never could understand or see the need for all these fancy commercial bubble bags and traps, but like the idea of a header more as a reserve than anything else and gaurantees the pickup to the turbine to be fully in fuel at all times.