You both seem to agree on the blatant lie that a 2/3 parliamentary majority is needed for any significant constitutional reform.
This is patently false.
The Constitution may be altered in any part by a Bill passed by a majority (33 or more), assented to by the President, and then placed on referendum.
The 2/3 majority rule is only used to bypass a referendum.*
With the sole exception of amendments to the essentially worthless fundamental rights articles which demand a referendum at all times and under all circumstances.