Yes you could, a few years ago I took a hi-res picture of the nice side of my Joust playfield since after buying it, I stripped the old yellowed brush applied varnish from the playfield and found out that the playfield was shot on one side at the outlane, I got the photo printed on a decal, I applied the decal on the playfield and clearcoated over everything and it did a great job, you could never notice, even I pointed it out to someone.
If a guy like me who has no knowledge what so ever with printing processes can do it, anyone can do this.

Agreed.....but when it's not available, you make it.....
Just like plastics protectors, I buy them if they are available on the market for the game I have, but otherwise I make them myself with a polycarbonate sheet I bought many years ago.
Or you could buy the whole decal set, take the fish decal and sell what's left, that exactly what I did 4 months ago before clearcoating my Road Show, that way you pay only what you need.