Also have a 23 Tsunami.
All the window material shown in the first picture was 30 gauge polished vinyl.and when the pic was taken it was about 6 years old.
The clear panels above the windshield along with the thread in the soft top started to get ratty.I think I was at fault for the demise of the front panels becausel I used rainx on them and later tried buffing them out with Flitz.They became very cloudy.
So, I had the whole top re-stitched with teflon thread and had the front clear panels replaced this spring with Strataglass. The Strataglass is really as clear as real glass.
The guy that did the work on the top had some extra strataglass kickin around so he gave it to me for the price of regular vinyl.(it still was outrageous).
I wanted the front panels as clear as possible as I always stand up when we are heading out of the harbor. It tends to be crowded in the early morning i need all the visibility I can get.
The side windows you see in the first picture and the rear drop curtain in the second picture are the original 30 gauge plastic that was done six years ago and I'm still using them.
They're not as clear as new,but are still pretty clear and probably good for another couple years.
This top and curtains stay up all year from may until october when I have it shrinked.At that time I roll them all up and lay them inside the cabin.
There is a product that the canvas guy gave me in a spray can called "Klear to sea" and it works very well to keep the plastic in good condition.Amazon has it in stock,I think it's around $15.00.
I think that 30 or even 40 Gauge polished vinyl would fit the bill for you,as good as anything else.It's pliable enough to loosely roll and store in the off season.Of course nothing is as good as real glass,but we don't have that luxury.