68 barracuda fastback rear glass installation

OK real dumb question..

Can the rear glass on a fastback be reinstalled 100% from the top side?
this car has massive tubs and a monkey bar cage in it with a X brace.
I am debating on going with Lexan and using rivet's part for that race car look.
and part because I am fretting installing that glass and trim.

I am doing the final fit and trim on the back interior panels before removal and paint.
It is so easy reaching thru that big back window. Then the wife asked how you going to put this trim back
when the glass is in? hum? hum? do you think you can..... NO I cant CAME OUT QUICK!

Anyone else install a rear glass into a fastback that is caged I have seen them before.
The wife says she aint crawling back into that back area again LOL
Grandson is smart but only 3.

I have a new seal and a clean glass. am I going to have to somehow get up in there,
and install the trim from the inside.
I have not really thought about but thinking more about it now.
Rear glass is months away, but it is something I do not have a path forward on.

Thank you in advance for any help.