Allow me to offer $.02 on this and I'll go away.
I get the motivation to come up with an alternate Imperial wheel/wheelcover, since I think some of us find the "plain" 1970+ style such a letdown. One thing I'll say is that if you're going to run the stock covers, they better be mint. Add a few dents or remove some shine and they really look bad.
If I had to choose an alternate, it wouldn't be the road-style rims, and I'll tell you why... They look great on a Chrysler, (or Plymouth/Dodge) but fusie Imperials already suffer from being too Chrysler-like and the last thing I want to do is make an Imperial look like a fancy Newport. Then add some puffy K-mart accessory-aisle pentastar stickers from the 80s over Chevy logos and I want to heave.
So what does that leave? '69 covers look good but they also don't look right. I've seen the '62/'63 style on '72/'73 and they look surprisingly good on these cars but again, they look bad as soon as you see a dent.
Having exhausted all wheel cover ideas, we must look at aftermarket rims. This gives the advantage of stepping up to 17" tires, which I found a huge asset on my '73. You still even have the potential of running whitewalls, either with Diamondback-type tires or by spinning some SUV tires into whitewalls, which I've also done several times.
I think you've can go in two directions here... The first is trying to give your Imperial the look of a luxury car that was used to pull a race trailer circa 1973. In other words, a style that was period-correct when it would have been new. My '73 Coupe had Motorwheel Spyder's on it almost from the day it was delivered. (An unusual and attractive choice which tells me people didn't like those smoothie hubcaps even back then). I also think Keystone Klassics or some Halibrand-style rims give that look.
The second route would be to try and create the rim Chrysler should have offered on these cars to begin with. The closest I can envision would be something without too much "fuss" since the bodies are clean. I'm thinking this rim, with an eagle or maybe even the original 70s logo 3D printed on a cap.
The only wire-style I could see would be something very simple, but I'm not even sure I can get on board since most of them look like they were designed for 13" rims and just use the same wire length regardless of rim size.
Again, just some thoughts.