How to avoid edge aliasing with a distorted image?

[Egg Bramhill]

As an alternative you can use the perspective mould but you require a large original image (which you have)
Use the default perspective envelope to size as required. It looks crap!
Select / Arrange / Create Bitmap Copy
Set the dpi to 300 or even 600.
Move over the target photo.
Select both & create a 96dpi image.