which headset did you end up going with? I think that I am in the same situation. I am having some issues with the upper bearing cup in the headset fitting on my tapered fork. The one that came with the frame is too small.
Most bike I've built have
these from AliexpressThey are cheap( even cheaper the 11.11 ), and work very well for most frames here.
It is a conic interface.
When you press the headset, the conic part of the bearing goes down, and lock itself in the top cone of the frame.
If there is still a play after tightening the nut, you must put some spacers just before the top end cap.
Usually some 0.25mm shims are provided.
2 or 3 are generally enough.