In this question I posed the problem of getting an inhabitant of the planet Earthtoo into low orbit (LEtooO) using conventional rocket. Judging by the great answers there, it is - to my surprise - quite possible. Earthtoo has twice the diameter of the earth and the same average density, so the surface gravity is also twice that of earth. The density of the atmosphere at the surface is also twice that of earth (they need more oxygen to climb stairs), and the scale height is half that of earth.
Now the tootronaut is ready to come home. Total spacecraft mass is 1000kg, orbital velocity around Earthtoo is about twice that of Earth, about 15.8 km/s. Yikes! The kinetic energy to be dissipated is about four times from LEtooO than it would be from LEO, and as soon as you start loosing energy, you start falling into an atmosphere which is increasing in density far more rapidly than the Earth's atmosphere would, because of the much smaller scale height.
Could this be done with similar materials and techniques used for reentry on earth? Or would the higher velocity and shorter scale height be extremely difficult to handle using Earth's current heat shield technology? Would it need to rely heavily on propulsive deceleration? Would it have to be airplane-shaped? The Tooians jokingly call the reentry vehicle the "Flying Tile" for a reason.
I'm not looking for opinions or maybes here. Please use an appropriate amount of math and physics to back up your answer. Thanks!