I picked up a new truck, I didn’t even have any plates or tax for 6 weeks until the real plates turned up.
When living in Hat Yai, I would often ride through police roadblocks at speed, one time I got pulled over after my plate fell off and I was waiting a month before I could replace it, the police officer got a mouthful and rode off. I used to see police all the time, but now living in Khon Kaen for a year, I could count the number of police I have seen on one hand.
I had no issues without a plate whatsoever, which surprised me, so I presume a red plate not to be an issue, just complete the log, I would be surprised if anyone ever asks to see it.