There's availability to AUH on 25th/31st (daytime flights), only a short drive to Dubai, but neither is likely to be ideal.

Otherwise on BA, there are some seats to BAH or KWI, from where you'd have to buy a short connection.

The other one obvious one to mention is AB TXL-AUH. I believe you are guaranteed a flat bed on this route in J and as it's shorter it's only 100k for 2 return, only a little more than LHR-DXB (80k with a voucher), with lower fees that should more than cover the flight to Berlin (EZJ EDI-SXF?) and maybe an overnight there.