About plan #1, I believe GSC is considering natural weathering test in order to define 14 months until material approval. In fact, we do not need to finish natural weathering test in order to have an approval, accelerated weathering might be considered until natural weathering test runs. I guess development timing can be dramatically reduced.
About plan #2, if all properties values are the same, only MFI is increased, it is OK for part performance, but the material will not be GMW15549 T1, neither T2. I consider this a temporary solution, that requires a general agreement for all involved. This development is also take some time, once all tests will have to be performed, so take this in consideration before deciding.
Att