No, there isn't the .rpx version of it.... But you can create the channel forwarder with Haxchi Method, and it will perform in the same way as .rpx Channel. Like the picture below.
Does that leave me with a .rpx I can extract from NAND or SD? If Tiramisu actually allows it, that would let me throw it in to auto-boot when I start the console instead of even having to go to the channel.