Personally, I'd be risking neuropathy from the last two weeks (I have gotten it quickly, I think in only 2 weeks though it was many years ago, at 4 IU/day.) So if you're like me, depending on meaning of "safe," not safe.
Many certainly could do it.
However, I really don't get the point of pyramid dosing with GH (other than for testing the waters before using a high dose), let alone building so very gradually.
I'd just use 3 IU/day, which could be 1.5 IU 2x/day, throughout which works to the same total.