If you're using Arpasing, you can use Arpasing Assistant:
https://arpasing.neocities.org/en/resources/usage-w-assistant.html
If you're using VCCV, you can use Lyric Parser:
https://snowphones.weebly.com/lyric-parser-20.html
If you're using Delta English, you can use TT English Input Helper:
https://hunyoi.com/pub/tteih/
Alternatively, Delta English is compatible with presamp (after much adjustment), so you can use that to type phonemes for a whole syllable into a note instead of splitting up the note manually.