A partial answer
Some Bitstream fonts have the wanted pi. It seems to be just in Bitstream's implementation of the typeface, it isn't the same in versions made by others.
One example: Iowan Old Style Italic
Here's a few letters of it:
As you see the rest of the letters aren't the same, only the pi symbol (hex 0390) is the wanted one. There's only a few ...
File > Scripts > Load files into Stack..
Select the files or a folder containing the files and sit back and wait...
Photoshop will open each PDF, copy it, and combine them all into a single document, one layer per file.
Open Adobe Acrobat Pro.
Select File > Create > Combine Files into a Single PDF.
Click Add Files and choose all your PDFs.
Save the file.
Drag the new combined PDF into Photoshop.
To select all pages, click the first page, hold Shift and click the last page.
A very simple and completely free method would be to use a word processor such as LibreOffice Writer. Once you've created your document, export as PDF. Choose JPEG compression, set the Quality to 70% (the lower the number the more compression will be added), and reduce the resolution. Something like 150dpi should be fine for on-screen viewing, in fact you ...
Get a layout design program such as InDesign (high cost, but popular) or Affinity Publisher (low cost, tries to be an alternative for InDesign) or Scribus (freeware)
Make your design. The design file has only links to the image files, it can well handle your images.
Export or print as PDF. You can select the actual resolution and compression of the photos ...
Choose File > Save As or File > Save A Copy.
Type a filename, and choose a location for the file.
Choose Adobe PDF (*.PDF) as the file format, and hold down Alt (Windows) or Option (Mac OS) and click Save.
By holding Alt/Option when you click save it will open the dialog box to change/reset options.