Hi Steve,
We have introduced a merged Aspose.Pdf for .NET version recently. This merged version provides the functionality to validate the PDF files for PDF/A (1a or 1b) or it can convert a PDF to PDF/A compliant file. You can find a sample on the following link: Validate Document for PDF/A - 1a and 1b.
Also, please read this blog post to get an idea about the merged Aspose.Pdf for .NET. You may download the merged version from this link as well.
Moreover, as far as the second question is concerned, my colleague will reply you shortly.
I hope this helps. If you find any further questions, please do let us know.
Regards,