As noted at Facebook, we don't need a separate /a/ after consonants in Devanangari, since it is implicit with every consonant. Nice, since it is the most common letter in tp.
From years of experience reading and teaching Sanskrit, I know that there are recognition problems that start early and persist. These are probably less likely for the tp forms since there are fewer characters to remember or to look similar (no clusters and far fewer letters altogether), but /s/ and /m/ and /i/ and /o/ might cause some problems. There are several other /s/s available, though strictly eshes of one sort and another.