score:1
Hezekiah observed the Passover prior to Josiah.
And Hezekiah sent to all Israel and Judah, and wrote letters also to Ephraim and Manasseh, that they should come to the house of the LORD at Jerusalem, to keep the passover unto the LORD God of Israel. 2 Chr 30:1
Initially, they kept it the 2nd month, and thereafter deemed to keep it in the 1st month. Josiah then continues.
Moreover Josiah kept a passover unto the LORD in Jerusalem: and they killed the passover on the fourteenth day of the first month. 2 Chr 35:1
Between Josiah and Ezra, the bible is silent, but tough to argue from silence.
To back up to the beginning, after the first Passover in Egypt, they kept it in the Wilderness.
And Moses spake unto the children of Israel, that they should keep the passover. (Num 9:4)
They also observed it at first in the Promised Land under Joshua.
And the children of Israel encamped in Gilgal, and kept the passover on the fourteenth day of the month at even in the plains of Jericho. Jos 5:10
Between Joshua and Hezekiah, the bible is silent. More than likely, however, they were keeping Passover for couple hundred years before Christ walks the earth.
So, Egypt, Wilderness, Promised Land, Captivity (Hezekiah, Josiah), Restoration (Ezra), Christ all are signified by Passover.
Regarding 70AD Temple destruction, I mentioned this in the comments.
From a Christian perspective, we are the Temple of God (Jn 2:21, 1 Cor 6:19). Where ever a Christian observes Passover is where God dwells (Deut 16:16). So, after 30ad Christians have observed it continuously.
From a Jewish perspective after 70ad, their local synagogue replaced the Jerusalem temple. I believe they observe it continously.
So, generally speaking, your timeline appears fairly accurate with the addition of Hezekiah.