Hanging posters/charts

Because you are all knowledgeable I humbly again come seeking advice,

The adult son with disabilities has a large collection of posters, movies/movie stars etc etc I am getting past changing them over in his room every few days, there is only so much space.
Now when you buy posters etc from Kmart and similar they these racks with storage under, but yee gods and little apples trying to buy those brand new start off $1500.
I suggested a bulk lot of aluminium hangers where each poster is clipped into a al strip with 2 hooks,
Doudt the hooks would last long,

So I am trying to work out a way of having a vertical pole (metal/timber whatever, a type of lazy susan at the top with lots of arms coming out and 1 or 2 posters on each arm.

Or way innovative creative ideas suggestions can you come up with that cost cost me my pension.

How about an architectural plan horse? (Might need a google search).

You could double mount the posters on a rack and then just hang the poster on the wall with the rack support bar still attached .... swap over without taking it off the mount.

They are not cheap to buy new, but are now popping up on Gumtree or Market Place as offices move to paperless. The initial price listed may be high as they were drug money to buy new, but there are limited buyers and the sellers will by trying to move them on to gain space.

Unfortunately we offloaded the one we had in the office a few months ago.