Personally, (and assuming that you are using H&B unhopped Malt Extract) I'd boil up the hops for 30 minutes in a couple of litres of water rather than make a Hop Tea. The reason being that I have often lost the bitter taste and aroma of hops during fermentation from a Hop Tea - but never from fully boiled hops.
Towards the end of fermentation, the Dry Hopping you suggest sounds fine.
BTW, back in the day before pre-hopped LME I used to boil up the LME along with the hops for an hour on the kitchen stove. This mixture was then strained into the FV and cooled with tap water before introducing the yeast.
It stank the house out, quite often the kitchen walls were running with condensation, but it did produce a brew that was much better than the four or five beer kits that were available at the time!