Sports cars don't have auto transmissions. /rant
If you can't drive a manual in peak hour, then you shouldn't be driving a manual. If Nissan thought the GT-R needed an auto, then I'm sure they would have made it an option.
I would think that if your RB26DETT is trashing transmissions (manual), you will be lucky to make the first 60 feet with a GTS4 auto - it was, after all, only designed to handle a 160kW RB20DET. If you MUST have an auto, I would reckon the box from a Stagea might have the innards to handle a bit of grunt.