I’ve just gone through this as well, following laptop failure. I went with a mini pc for my observatory (shed) rather than another laptop as it was cheaper and certainly meets my needs.
I set as much software as I could with the pc running in the house, and then used ASCOM simulators to test as much as I could. There’s a very useful YouTube video that explains how to set this up. The focus is on learning to use various packages, but it works just as well as learning to use simulators to test software.
The internet connection to my obsy runs over mains cables, you don’t say whether you have mains power at your setup, but it’s worth looking at if you do. Then again, whilst I can see the disadvantages of using a long Ethernet cable, it would at least give you a temporary solution whilst you get everything set up and working, especially if you can borrow one.