Ancoring with a mast at the bow
I haven’t got that much experience with anchoring with a sloop JR, but my first junk, the 7.1m/23' Malena, at least, tacked about badly when anchored from the bow, so I later anchored from the stern (protected water, no current). It is at such occasions I wish I had a yawl.
Still, I have (safely positioned in my armchair) wondered if one or two methods could be helpful when anchoring from the bow:
Offset anchoring
As this diagram shows, a second line is attached to the anchor rope (or chain). By cleating it from a point at the cockpit, one can adjust the offset angle just enough to prevent the boat from going about. Remember, the anchor chain and this second line form a bridle, which in effect extends the bow. The shown offset angle is probably (hopefully) wider than what is needed to tame the boat.
Bucket or drogue
Another armchair idea is to tie a big bucket or drogue to the anchor chain and let it sit just below the water surface. On small and light boats, this could possibly stop the boat from yawing about.
I bet the Chinese, those who had the forward positioned centre-board, dropped it and raised the rudder to get the same weather-cock effect. Could it be that their tall sterns also were built to help weather-cocking when at anchor and when sitting hove-to?
Arne