I did indeed as @NixonRedgrave said - weird-a$s setup. I bet nobody else ever tried to push what I’ve done 
In fact up until last week I was using this, but I finally “treated myself” to a real desktop and I’ve shifted to that now.
But for 1.5 years I was pretty happily using a OneXPlayer 1S (Intel i7 11th Gen 5Ghz quad core, 16gb DDR4, 2560x1600 screen but crucially, read below, it has a Thunderbolt port). They have a new AMD Ryzen version out now which may actually be worse as it does not support eGPU’s.
At first, I was just using the native Intel Iris XE graphics and built in joysticks, but that was pretty limiting and had to have 40% render scale to remain playable so I bought a Gigabyte gaming box eGPU (RTX2070) which plugs into the Thunderbolt and it completely transformed what it can do. It NEEDS that. Works handheld (sending video signal back down the same cable that is also used to power and charge it) or with external monitor.
Then in the other USB-C port, I put a USB-C hub with all my peripherals. Plus the eGPU has more USB ports so had another hub in that and things like TrackIR plugged directly into the monitor via a USB Extender from 1 port of one hub and fast Ethernet via an adapter. On top of the 1tb fast NVME in the unit, I had a 4tb external USB-C Hard Disk for mods and backups, and internal 1tb SDXC card (slow, but was OK for liveries and other less demanding games - just slower loading).
For the size, and that it’s only 27 watts TDP (plus the eGPU of course!) it’s really amazing what it could do BUT it had limits for sure… which I got tired of and now with a cutting-edge desktop I have (AMD 7950X3D + 4080) it is a completely different story really.
But to answer your question - yes it works fine, and I really enjoyed using it (in bed, or at my desk!) but you need to play to it’s strengths and so if you choose to fly simpler planes (not Fenix!) at less heavy areas (not New York!) and live with TLOD around 50, then it could easily hold 30fps at 3440x1440 resolution of my external screen, or the 2560x1600 internal no problem. Mainly smooth sailing. If I unlocked the frame rate it would wobble between like 34 (over non PG areas) to 65 (over empty sea) but locking at 30 gave a more smooth experience. In PG areas it could drop to mid 20’s.
I never tried Fenix but the A310 REALLY struggled so I guess it would not handle a really complex plane. The most complex planes I had (in terms of coding / CPU load) were probably the BAe 146 and the DC-6 - which after NanoVG was introduced both ran great - really smooth. Vision Jet was also fine with all those “virtual screens”.
This was my setup - it could run all that hardware pretty well TBH.
(eGPU is the box behind, so still pretty portable, and comes with a carry bag)
I will be selling this lot if anyone is interested! 