Makes sense. Thanks Again.Basically yes. Procedure if you are qualifed:
1) Kill power to circuit at breaker. Confirm anything controlled by any switch in the box is now dead.
2) Open up switch box.
3) Confirm that the 3 way switch has a black wire to the common terminal, and black and red wires to the other two terminals, which wires are part of a single 3 conductor cable.
4) Remove both black wires from the 3 way switch, add a black pigtail, and wirenut those 3 together (or use a WAGO Lever Nut)
5) Connect the open end of the pigtail back to the common screw of the 3 way.
6) Close up the box, restore power, and see if the desired change has resulted. If not, further investigation and reporting is required.
Of course, the above might result in the bottom half of the receptacle being unswitched rather than the top half. And rather than add a new connection point (the wirenut or WAGO) and pigtail, if the black supply to the common of the 3-way itself comes from a connection point, it might (or might not) be more elegant to to just move the black non-common on the 3-way to that connection point. But the above procedure was simplest to spell out.