My bins always lean acidic. I read 6-7 is ideal but usually adding some crushed eggshells and more leaves gets it closer to ideal parameters. It always confuses me because ammonia is created when organic matter decomposes ammonia being alkaline but when ammonia breaks down it causes acidic results.
I cant tell you definitively that it will be fine but if you dig your feeding container in and give them a small area of neutralish bedding and some form of calcium then I believe from my own
experience that they will adjust and thrive.
This has worked with redwrigglers from uncle Jim's worm farm as well as big European night crawlers in controlled environments like a warm tower when the bin is over fed or too damp.