Is it possible to have an alpha channel/mask with virtual textures/UDIMS?

I’ve been totally brick walled attempting to apply transparency to my characters outfit with UDIMs, however I keep getting proposed the same error message each time I make an attempt to get it to work. Is there an alternative method to getting this transparency to work without having to assign separate texture sets to each of my UDIM tiles? If not, do the UE4 devs plan on fixing this issue in the foreseeable future? Thank you in advance for providing feedback. (FYI, This issue persists in both UE5 and UE4.27)

Use a Masked material and save the alpha mask as linear data into an R G or B channel