I have used a LogoJet UV2400 that does exactly what you want to do. The are very impressive, but not cheap! I have done stone tile/coasters, golf balls & tees.
Years ago, we were running a Mercedes-Benz car book on our new 8-color 40" Sheetfed. One form had the paint options pages. It was 24 plates for each side! A total of 6 passes through the press. What a nail-biter!
I agree. I had a 9900 that had to have 2 head replacements in 5 years. The x900 series has been discontinued. The SureColor P Series is EPSON's suggested successor.
All tree printing technologies allow you to print on clear or metallized substrates, among other finishes. Window clings are an example of wanting to have a white down before or after (depending on whether is is applied inside or outside) printing 4CP.
One time we used opaque white on our Indigo...
I've tried that and usually it is two, three, four or more times going back and forth with the customer.
Either they don't understand or don't have the abilities and/or talent.
A lot of shops also experience what claude72 stated.
Where I worked in the past, if I had taken that approach and the customer complained, my boss would have lit me up for either not fixing it or not catching it. It wouldn't matter if it was the customer's mistake.
Back in the early 2000's we had a Harris M110B (heatset half-web) re-built and the solid ink blade was replaced with segmented ink keys. That was back when Heidelberg owned Harris, though.
Although I have never owned a Xante Impressia, I have had a demo of one. I was impressed (no pun intended).
I believe it is built around a RICOH Aficio SP series printer.
I've had two of these printers over the last 10 years.
They are absolutely rock solid!