I taped the DD open and taped over one of the blade edges. This gave me one blade edge to shave with and because of the comb, I could only use one side of it too. This was my makeshift "Omote" side.
Of course, this new setup brought with it it's own challenges.
Being right handed and only using my right hand throughout, shaving down-strokes (1st pass) on the right side of my face meant my razor hand was on my right ear, and similarly, shaving up-strokes (2nd pass) on the left side of my face meant my razor hand was all the way across my face and on my left ear.
This caused a bit of an issue with the side burn areas because unlike a real Kamisori (I presume), this razor doesn't have anywhere in the handle for your ear to pass. Still, I managed ok.
The neck area brought similar challenges too of course, but thankfully the taped-straight handle didn't interfere with the upward-pointing sweeping arcs as I feared it might, although it only worked on the right-side of my face of course. For the left side I had to invert the position and have the razor pointing down. Fun and games.
Overall, I ended up with a slightly better shave than before. I did a considerably better job of my chin and under chin area on the ATG pass than I managed on my previous DD shave, and I had no bleeding or soreness. It wasn't quite as comfortable as before though, and I put that down to the blade losing it's edge quite quickly due to only using one of its edges and I was having to go over areas a bit too often and with more pressure than I'd like. It started to feel dull about half way through the ATG pass and although I did eventually stop, un-tape the blade and spin it around to expose a fresher edge and re-applying the tape, I should perhaps have done it sooner.
Overall though, another good and very enjoyable shave but I think a sharper blade would make things considerably easier.