The most similar position I recall to the one you mention is the following:
In the final position of your diagram, tha a6 move seems not to make much sense/purpose. That position reminds me of a classical French position in which Black is much better placed. The position in question arises after 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.e5 Nfd7 5.f4 c5 6.Nf3 Nc6
What do you think, has Black achieved more on your diagram, or in the French Defense line? That's why I wouldn't recommend the move order you mentioned.
I am no MD expert, but this is my honest opinion. All comments and critics are most welcome.
I play always this against f4. It's ok? i must play h5?