Is it possible for you to make two specific roads for a DDI type intersection? The first will be like width of the 2+2 heavy road (or this type) with a tiny concrete median or barrier and the lanes backwards (so on a RHT map they would drive like a LHT map), the second will be like the 8 (4+4) lane road on NExt2 but with the lanes also reversed in the same way.
I have tried to make both but I don't understand how to dump the NExt2 roads with bridges, tunnels, slope etc. It is possible to use complex traffic light signals with TMPE to make a very compact interchange this way.