Trans-literate works for rough transliterations into Shavian (I can't read Glagolitic, so I don't know about it), but it transliterates individual letters instead of words, so many words are still partially in Latin or are transliterated wrong. It would work better if it used a word list and left unknown words along like some Shavian translators I've seen. I wouldn't say it's accurate enough to make for good Shavian practice.

I do appreciate how easy it is to use. You just click it in your extensions list and select a script from a drop down box. Ðat's one þing it does right.

Would you please add Pali?
https://siongui.github.io/dart-online-input-method-pali/
I am willing to help.