Item Get sound https://www.macincloud.com/
I don’t know if their pricing structure has changed a lot since, but I had used this service in the past when trying to get something published in the iOS App Store, or in the Apple Books store thing, for a client.
Last it was just fill up $30 of credits or so, and get billed $1/hr out of the credit for how long you’re logged in.
I have a lot of gripes in my past experiences of the iOS/macOS ecosystem, especially with ebooks and them trying to make you author it only in their macOS desktop app, for something that’s effectively just an ePub creator with proprietary extensions. You can’t even upload the ePub on the web management portal, it has to be done through the macOS application, which brings you to the web portal for the rest.
But yes, I also used it for iOS app dev and publishing. Last time I did, it was $100/year just to even have a developer account, but allegedly that may be waived now. Also you had to have the serial number (or whichever) of an iPhone registered to the developer account, even though you have a full iOS emulator in Xcode. It didn’t even matter if you actually launched it on that iPhone or not, just merely that it was registered that you allegedly have hardware.
Oh boy, and review process–that’s another story.