Okay, so I've been testing compiling DW Pro with the Sonoma build option turned on. The results of that are at the bottom of this post, but first a bit of an unrelated DW compile test...
The following is all in OXT Lite v1.08 beta.
I first put a fairly large stack together. This has just got a lot of images in, on multiple cards. Simply to bring the stack size up to something fairly beefy (36MB).
I then tried to compile a standalone as a slim x64 MacOS build. (which works as expected - note the time taken)

- test-1.jpg (228.84 KiB) Viewed 3534 times
So next, I tried it with the Sonoma patch in place. As you can see, it took roughly twice as long.

- test-2.jpg (229 KiB) Viewed 3534 times
Now, bearing in mind that stack is only 36MB, I then thought I'd chuck something rather more substantial at it. (I did this the day after though, on a more up to date mac - to try and mirror as closely the results Richmond was seeing). This is where the DW Pro part comes in.
Building DW Pro for plain x64-bit MacOS (with no Sonoma patch) takes around 21 seconds. That's probably about right, based on the increased size of the stack. (The DW Pro stack I have here is approx 112MB in size).

- Screenshot 2024-08-30 at 08.30.55.png (445.6 KiB) Viewed 3534 times
Turning the 'Sonoma' patch on, and trying to build.... gives this. At least I'm getting the same thing as Richmond, so it's consistent. It seemed like it had frozen or something, but I gave it the benefit of the doubt and waited...

- Screenshot 2024-08-30 at 08.33.04.png (715.85 KiB) Viewed 3534 times
It eventually did build, and just the Sonoma-patched MacOS x64 as asked, however it took a very similar time to what Richmond experienced (when he went shopping and left it doing it's thing). Curiously, I also get a popup about lipo needing to be installed with the xcode-command-line tools. I don't get this when building with the unpatched (non-sonoma) standalones. So that's interesting too.

- Screenshot 2024-08-30 at 08.43.03.png (842.97 KiB) Viewed 3534 times
I wonder if it's purely that the codesigning isn't properly in place on the "sonoma-patched" standalone that the IDE uses as a template in it's runtime folder. That might be the reason why, I'll need to check that when I get a moment.
I'm not entirely sure if it's also something going on with the DW Pro stack (don't shoot me Richmond), please hear me out
I tested a large stack on the exact same machine, this is WITHOUT the sonoma patch, and a stack about 50MB in size.

- Screenshot 2024-08-30 at 08.13.08.png (296.68 KiB) Viewed 3532 times
About 11 seconds. Okay, so using that logic, a stack double the size of around 100MB should take about ~22 seconds to build?
I tried the same 50MB stack WITH the sonoma patch:

- Screenshot 2024-08-30 at 08.14.09.png (295.8 KiB) Viewed 3532 times
It took 15 seconds. So using that possible logic of double the stack size (akin to Richmond's DW Pro stack of 112MB), the time we should be seeing to build a Sonoma-patched DW Pro standalone should be about 44 seconds?
It's also interesting that I don't get a prompt about lipo in this case, so I wonder if it's something that's being detected in the 'search for required inclusions...' option? Something that might be used in the DW Pro stack, that is triggering this lipo error and the huge build times? There's certainly something the 'search for required inclusions...' part doesn't like when putting together the Sonoma-patched version.