Your thinking into it too much, there is no way to return to stock unless S-OFF is achieved, and it must be bootable with a unsecure kernel to do that.
If you locked on a non-stock recovery, this will softbrick... in some cases if you had an engineered hboot, it can hard brick, but I don't think this is the case.
The quick fix is simple, unlock again, flash a stock-ish ROM (like http://forum.xda-developers.com/show....php?t=2260154
) or known good ROM like Tachyon... REMEMBER that when flashing S-ON, you MUST flash the boot.img seperately via Fastboot.
If you can't get to recovery, you can always boot it by pushing the img in fastboot mode and wipe/flash from there.