Good to hear from you and that you are ready for another shot at 2:45 !
I think your plan makes sense. A structured approach with Lydiard, leading into the 100 day plan. Especially as you have quite a bit of experience with the plan at this time and would likely be able to go through it even stronger with a bit of a wider base to it.
In addition to this, pay attention to the self-massage part I talk about in the 100 day plan. This is powerful stuff if you do it at a regular basis.
I wish you all the best of luck,
MariusArthur Lydiard was so far ahead of his time it's almost mind blowing, check out this interview below , in the last section he talks about minimal running shoes and how they will make you FASTER!