I did that, i used indoor electrical wire, big whoop i have like 10,000 ft of it on a spool so why bother paying for special car audio wire when its the same stuff. Anyways just run another wire from the amp with the remote wire to the other amp. thats all i did and it worked fine.
If you're gonna give advise, please take in consideration the copy of a copy effect.
When you make a copy of a copy and then use that copy to make another copy, and repeating this process over and over again... the next thing you know is that you have a copy that is no where close to the original.
Take the safe bet, and follow proven steps. When it calls for a specific wire, use that specific wire, otherwise you will end up with another problem.
By the way; for power wires, AC circuitry require solid strand wire, while DC circuitry require stranded wire. There is a reason for this.
Please don't try to re-invent the wheel, and/or get away with stuff by taking shortcuts.