I've made tea frequently with already vaped flower. You need to let it steep with coffee cream so there's enough fat (maybe full fat milk but I always have coffee cream). I normally make it with a chai tea blend as it is a good flavor. I let it steep for a while in a teapot covered with a cosy or towel to keep it warm. No issue feeling the effects. It will smell like weed.

I am not a chemist but from what I understand about decarb, steeping it in tea is not sufficient.

This research paper seems to indicate that you could skip the decarb step if you will be steeping for ~60mins at a consistent boiling temperature. But it is likely much more effective to decarb for a few minutes prior to infusion. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5549281/#SD1

THC / actives are oil based. If you are making tea, add a bit of creamer or something for those oils to adhere to. Water won't extract or carry them very well. You need something with the water to dissolve and carry the actives.

You could decarb by putting it into some coconut oil and then slow cook it for a few hours. Strain while hot. Use the oil as part of your tea concotion.