I do something similar — currently playing at 2560x1440 fullscreen on an external 4K monitor (playing at the monitor’s native resolution would melt my current laptop in minutes…), with UI scaled up a bit.
When you say lowest resolution I assume you mean 1024x768? Feels rather smallish, but on a 14" screen I guess it would work.
I may still go for the Max in the end (can connect 1 more external monitor…), but thanks for the feedback!