I would recover the targets with letters in Indy-Font. The targets on the upper end * * I N D I A N A * and the targets right J O N E S.
It would integrate the theme a little bit more.
It is esay to do:
Printing on Photo-Paper, laminate the front side with clear tape and the back with double sided sticky carpet tape, color the small side with an edding in the color of your targets (best would be black).
Ready to use.
That is the way i fresh up old targets like you can see here

5 Targetdecals Vargas L (resized).JPG

Hello,
it is easy to recover the targets with washers (see picture 1, there will be one out there which fits). Then, with the metal dot in the middle, you have a plain target where you can stick whatever you want (see my description of making custom targets).
The idea to take Indy on them is a good way to integrate the theme.
Maybe like the original (see picture 2) with a little work in paint or other software you can create a round target with Indy.
1 (resized).PNG2 (resized).PNG

In my opinion a drawn Indy (Williams-Look) would fit bettter to the drawn playfield.
Use pictures like this one https://www.darkhorse.com/Comics/15-503/Indiana-Jones-and-the-Tomb-of-the-Gods-3
You can cut out the head like you did with your ones (Stern-Look) and label it on the slings.

I am a friend of low-budget modding , so us packing tape, you can´t play it weary. Do it.

Here an example of my low-budget modding on GoT Pro https://www.flippermarkt.de/community/forum/threads/sparbroetchen-modding-am-game-of-thrones.177751/
Most of the parts are created for nearly zero Euros (or Dollars, in this case it´s the same )

Hello, they don´t. Surely not after a few games. I had never to do this because of looking bad after a while. Never.
And IF (because your pin is sitting in the sunlight), you can replace them in one minute.