Hi! I’ve been walking that road the last few weeks and this is kind of the overall landscape on the situation:
-You can build an unreal app for iOS without a Mac if you use blueprints exclusively and don’t use any plugins.
-You can’t build an ARKit app on windows, unreal needs to send some files to be processed on a Mac, but on the weird side of things, you could run a virtual machine with Mojave on your windows PC and use it to do a remote compile. It will work horribly, because there’s no video acceleration and you will lose a little bit of your soul in the process, but it will do a remote compile of at least the sample project, I wouldn’t recommend it for a complex project, but at least the default template will compile.
-You will absolutely need a payed developer account to generate the certificates, I tried extracting them from XCode on my mac, but it didn’t work, maybe if you can work around it and have more patience than me you will succeed.
Here is the guide to set up remote compile that worked for me. How to setup Remote Build ? - UE4 AnswerHub
This video helped me get up and running with certificates and all the iOS madness. 16 - iOS Set-up and Development - YouTube
Best of luck fellow tinkerer, and if you follow this path, consider buying a Mac even if just for remote build, I’m using my old Macbook pro 2011 and it’s so much nicer than a VM,