@Dav , I was hoping my last post made it pretty clear to stay away from the Oki line altogether. You really won't be happy with them when it comes to performance, quality, and cost per print. I also wouldn't buy anything from OKI because they announced in 2020 that they are no longer manufacturing and selling equipment.
I'd suggest a unit from one of the bigger manufacturers. A Ricoh Pro C7200 Graphics Arts series would be my first recommendation. It handles 360gsm and has white ink, excellent quality, and a predictable cost per copy print since they will have a CPC plan vs paying for the consumables on your own with the OKI. You can finance the Ricoh to make it more affordable instead of buying it outright upfront if needed.
If the Ricoh is out of budget even with financing, then a lower-cost option that still meets your needs would be the Xerox PrimeLink C9065 series. That unit can do 350gsm, has a white
shipping label printer, and will be at a much lower price point when compared to the Ricoh, but will be slower. As a bonus for both the Ricoh and the Xerox, the white station can be swapped to several other toners including clear, neon, and metallics.
FYI, I used to sell the production printing line for Konica Minolta.