I’d suggest setting a search on eBay that notifies you, if and when a set becomes available. Looks like one set may have sold recently.
Alternatively, could you work from the artwork on Microscale’s website? While that may seem unethical at first, the facts that (A) you’re not going to sell these decals that are solely for your own use, and (B) they’re unavailable from Microscale in any scale might mitigate those concerns.
DFF