Hey @Dead-Pixel, I've found that the following has to be done with Construct 3 xcode project exports:
Export project zip from Construct 3
Unzip file on MacBook and use as Xcode Workspace folder
Open Terminal on MacBook and change directory to Workspace folder
Type ‘pod install’ in terminal while pointed to the Workspace folder
** That will install all cocoapods pods necessary for building game
Add all metadata to the Signing & Capabilities and Build Settings
** Make sure Game Center is added as a +Capability from the submenu under Signing & Capabilities (if applicable)
Select Swift 4.2 for Swift Language Version for Project and Target
However I do believe that you have to update to the latest version of xcode, which might be tough for some 2015 and older MacBooks, so...looks like you gotta bite the bullet and invest in more Apple hardware. I personally really wish we could have an iPad xcode app, but apparently that's not technically feasible?