I am working with a manuscript that uses upadhmānīya and jihvāmūlīya for visarga before p/ph and k/kh respectively:

The script is Śāradā, but I was wondering (a) whether these letters are used in printed Devanagari texts at all recently and what their forms are, and (b) whether anyone can suggest a Devanagari font that implements them correctly. I am wondering whether it might be worthwhile to retain these signs in a (Devanagari) edition of the text, or whether I should just regularize them to visarga. (The codepoints are in the Vedic Extensions Unicode block, although unlike the codepoint for visarga, they are not combining characters.)