No brainer as everyone says. Think I got 2 for £4. I presume you can disable keyless too like you can on the Mk7.That’s what I always do.
I’d be surprised if you can’t. I always do this with my Polo GTI+ which has keyless as standard (given the choice I wouldn’t have specc’d it - using the buttons on the key fob to lock / unlock the car and key to start the car is no hardship!)
If using Faraday pouches, we aware that the metallic lining in these pouches can fail over time, so it’s always advisable to check them periodically to ensure they’re still blocking the signal - easy to check; just put the key in the pouch and with the key+pouch on your person, try opening your locked car. If the door opens, time to get a replacement pouch.