That's tough, Mark.
However, eBay is pretty amazing and I bet your decal will show up there sooner than you think.
With my luck it will be later rather than sooner.
Hobbylink Japan has the sheet on back order, for what that's worth, and I placed an order for one. Rising Decals also has released the markings for "Dikam Death" in 48th scale, so I have that sheet on the way. I have a spare Hasegawa P-40M (aka N-1) in my stash with no plans for it, so that will work. I just don't relish the thought of starting the build all over again.