I don't think that's a very good idea.
Firstly, men and women are built differently, with men being generally bigger and stronger, and as a result the weight classes for men and women should be determined separately. This seems to me like it should be common sense. Even the men, in the range you discussed, only have the 85s, 94s, 105s, and 105+.
Secondly, I looked at the bodyweights of women competing in the superheavyweight class at worlds/olympics all the way back to the '08 Olympics and there was a grand total of 4 women who weighed in at 300 pounds or more (3 of them American); from 2012 on Holley Mangold and post-ban Sarah Robles have been the only ones, and before that it was only Olha Korobka (until she was banned in 2011 and retired) and Cheryl Haworth, who weighed in at almost exactly 300 pounds (official BW 136.29kg) at the '08 Games. The average weight of the competitors was generally between 100-110kg (~220-242 pounds), and none of the 300+ pounders won any of those competitions. Basically I think the knee-jerk reaction to juggle the weight classes because of a few extreme outliers is the exact opposite of how the weight classes should be determined, i.e. through an analysis of the distribution of lifter size around the world. You have to look at the population as a whole, not at individuals.
Third, I have seen it argued earlier this year that adding even one women's weight class between the 75s and 75+ wouldn't make sense because there isn't a sufficient depth of competition. Of course, as drew alluded to, this is what they're doing. Everything I've seen has indicated that they're adding an 85kg weight class, which would change the supers from 75+ to 85+ and give the women the same number of weight classes as the men, and also allow countries to bring the same number of female lifters as male (maximum 6, up from 4). This is a direct result of the push for gender parity and I think it's a good thing, the only argument being where should that extra weight class fall. Adding one inbetween the 75s and the supers allows them to achieve gender parity without redoing all the weight classes and rewriting the record books. In any case creating 5-6 weight classes where right now there is one would dilute the competition virtually to the point of absurdity, though not quite as bad as those powerlifting competitions where almost everybone gets a gold medal.
Pretty sure the heaviest I've ever seen Kashirina weigh in at was 108ish, and she won the world championships from '13 to '15 and holds all the junior and senior world records for the superheavyweight women, I think calling her "competitive" is to sell her a little short.