There are some Bengali script books containing Pali and Prakrit texts. For the missing conjuncts, many just use the Virama. Supporting the full set of conjuncts for them will be helpful as the first step for documentation of all the common Sanskrit conjunct forms.
The number of consonant conjuncts which can occur in these languages is much less than Sanskrit.
The details are given in the below document
Prakrit and Pali consonant clusters.pdf
Many of these like ssa, nha, lha, nta, etc can occur in Sanskrit as well.
Around 15 conjuncts are additionally needed to support Prakrit/Pali in Bengali.
The details and the forms are given below.
Additional Bengali conjuncts for Pali_ Prakrit languages.pdf

If anyone is interested in supporting in their fonts, can go through manuscripts and try to provide more details if needed.