I would talk to the client and explain that there are two options:
1. Pro Work.
If the PDF is intended for professional print, then you can not leave to chance the output PDF, yes they could use something, but Are you sure the color profiles, text, compression, and resolution will be re-saved correctly?
If not, they have to send their logos up to an email address on a specific date and have the logos reviewed on a technical basis if they work for the quality they need for the project.
2. Amateur work.
Let's say it needs to be printed in the office, or something. It probably can be could be prepared on a program that everyone has, Word? PowerPoint?
It could be opened on a program everyone can have, probably Inkscape? Scribus?
Or prepared on an online platform. There is a library called Fpdf http://www.fpdf.org/ where you can put a high-resolution image, a form and the class can merge the two on a PDF.