Sorry I don't know of any tricks for Priests like I denoted previously for Warlocks. In future expansions there are items that will allow multiboxed toons to face targets but I don't know of any for Classic nor likely for Classic-TBC.
Your best bet may be to have a macro that does a 360 spin spamming Flay till you acquire the target and stay on target. Not sure if that is doable or not but if you could do it to where it stops trying to turn once it reaquires it's target and starts channeling then it may work. Maybe try to check if not channeling swing 45% and try to channel, then if not channeling another 45% until it fires... Not sure if this can be done but worth a shot.
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