I sometimes make challot like this for some holidays or when I think up a nice dip to have with it on Shabbos (so i can put a bowl in the middle like some fancy schmuck), I find it works to braid as normal (but with thinner, longer strands), but without pinching the end when I'm finished braiding. Then bring the "loose" end around towards the pinched end, lay the strands in a way so they looked conjoined and pinch and roll them together. You can then gently shape it so it looks fairly contiguous, egg wash and top as desired.
Love watching your progress as you post! Thanks for sharing all the delicious looking bread and I hope the tip helps!