News on the
AOPA Italy site says that the house of representatives and the senate has approved the amendment. The remaining step is just publication which is a pure formality.
This means that the tax on foreign registered airplanes only applies after a consecutive stay of 45 days and does not apply when the stay is due to maintenance.
The tax has also been lowered for those affected. For us non Italians, this should fully address the issue. For those who live in Italy... still tough times!
(PS: the fact that the senate as 2nd chamber has also approved is only mentioned in the Italian message)