Zero year in an education course is a year in which no new admission will be made in an existing course that is being pahsed out. This zero year concept is for people already in the system to finish it. Also no new colleges will be approved or granted.
B.Ed has had many changes, in 2014, it was increased from one year to two years which led to a drop in number of applicants, many colleges were closed down. Students and collges felt that an additional year is wasted without any new or extra degree being given. The new suggestion from the National Council for Teachers Education (NCTE lays down guidelines for the basic teachers education/qualifications in India). The new suggestion is to convert the two year B.Ed into a four year BA+BEd and BSc+BEd.
Since you are doing your PhD, I would suggest, try and compelete your PhD without any distractions. Then you will have a good oppourtunity for your career and job.
If you still wish to do your BEd, you would need to apply after you finish your PhD, and then qualify. Since the new rule is to be implement from 2019 onward and still the decision is not year, why not try and apply for IGNOU, write to them and enroll in the distance mode B.Ed given by IGNOU. IGNOU gives a maximum time of 5 years to complete the course.
Based on your time needs, finish your PhD with first priority and take up the modules whenever you are free. After 1 year(with PhD completed), you can focus on the B.Ed and finish the course. Any rule change will allow the old format candidates to finish as per the old guidelines, think about it because one regular mode course and one distance education mode course is feasible simultaneously with prior approval.