I'll try to explain why I have problem with this:
All the procedures we have in aviation cover for, at least, one (1) eventuality. If one eng. fails there is another one, and even when dest. is cavok we have to have fuel to one altn. in case some eventuality happens (like blocked rwy)...
So, we dispatch as you propose with trip fuel to original (closed) dest + altn fuel to further of two alternates, destination remains closed and we proceed to altn a/p which is behind/beyond destination. We will approach altn a/p with just final reserve fuel or with little extra if are we proceeding to closer altn. However this extra can be zero if two altn. are at same distance from dest.
However in case of just single eventuality, like blocked rwy at that altn, (and closed dest. is not an eventuality since it was predicted as so) we will not have fuel for a "plan B".