Once I've got a good base (3 - 6 months of MAF), _then_ weave in work that flirts with anaerobic threshold a bit more like the upper parts of this A2 workout. The other way to think about it is that once I have been doing this for 3-6 months, I can remove the 10 point handicap from the MAF calculation. (see this post: https://www.fatfitnessnerd.com/2023/06/my-maf-number-in-june-2023.html)
If I really want two ranges, shift from A1/A2 to MAFlow and MAFhigh
MAF : 114 - 124
MAFlow: 114-119
MAFhigh:119-124
See previous posts or https://philmaffetone.com/method/