I squirm when I think about the big risks of bonding Ilfochromes to either plastic or aluminium. It's not a 100% fail-safe method.
Hot adhesive bonding to aluminium substrate; it's a specialist task usually known to high-end Ilfochrome-producing labs where galleries/exhibition spaces fancy the clean lines of the frameless look, or the photographer embraces the minimalist presentation. The trouble is that the finished print (itself, often with minute bubbles or creases as a risk of the process) cannot be protected against the elements that can stain it over time (e.g. with a surface spray), hence the stronger preference over aesthetics for conservation-grade framing, which does afford the print perpetual protection.