Previously the Israelis stapled a piece of paper with a stamp on it, you take it out before you go to the GCC. Now its not even stapled. (They photograph your passport & stamp pages though...) https://www.touristisrael.com/the-israeli-passport-stamp/974...
Two of them are British, as am I. I looked into the process, but then changed the focus of my work and didn't need to travel so intensely. Essentially, I would have sent in a normal passport renewal form, and attached a letter saying "I'm going to X countries in the last Y months, so need a second passport". "I'm going to X as well as Y" is an equally valid reason.
Germany and I think most other EU countries with heavy industries absolutely do this, because it is necessary to do business in the middle east.
https://pointstobemade.boardingarea.com/2018/02/22/getting-a... https://www.passports.gov.au/using-your-passport/concurrent-... https://photos.state.gov/libraries/france/45994/pdf/second.p... https://www.service-public.fr/particuliers/vosdroits/F21517 https://www.rapidevisa.fr/actualites/174-comment-obtenir-off...
Learn something new on HN every day :-)
Normally you can get two/three passports for that reason.