You are a sucker if you pay for a Burns cable and the suggested heavy duty battery pigtail.
Take a look at the stock wiring, it handles the current fine and is by no means thick or heavy duty, at all.
First, the stock wiring is easily spliced into to make a bypass that will work with your ignition, the Burns cable does not, you have to unplug it to stop the pump.
Second, with your old controller you can build your own bypass cable for a future spare.
One supplier is hardly a "cottage industry", it is only one supplier.
Koolaid won't get you home. Using a good bypass workaround will get you home. Take a look at how many controllers have failed. The old silver colored ones.
Learn the bypass or send money. Your choice.