@combatwombat you have plenty of patience, just by how long it has taken to build your pond. Don’t change now, in keeping aquatic life patience is number one. Let the pond mature at its own pace.
My question to others is why try to avoid new pond syndrome ie the green water. You all do realize that is part of the process of establishing the base of the food web in our ponds ie phytoplankton, which is wanted and part of the initial maturation process. Besides the green water lasts a few weeks maybe a month then it is gone, never to return if your pond is setup correctly.
Personally, I would skip the bacteria in a bottle it is unnecessary. As there are bacteria colonies already in the pond on all wet surfaces and will expand as their food source is expanded, ie ammonia and nitrite. Just dumping in a ton of bacteria without an ammonia source will end up with the bacteria pop. Dying back, until there is a need for them to expand.
What I have done with my ponds is plant the hell out of them in the main pond, the bog, etc. before adding fish. Have never had an issue with plants not growing due to lack of nutrients. most of our water source ie tap water has plenty of nutrients initially in it to provide a source of food for the young plants.
Then slowly add fish, have usually had a very minimal cycle this way and never lost fish when establishing my ponds, or can do the fish less cycle as watergardener suggested, which is just adding ammonia source to your pond water to kick start the cycle and testing the water until your readings show the pond has cycled. You will still want to proceed somewhat slowly when adding fish, as you don’t want mini cycles to happen, if you add too many fish at once that the bacteria pop. Can’t expand fast enough to keep up with the Extra waste being produced. In this case you could add bacteria in a bottle, I have used fritz-zyme as I know this product contains live bacteria. Most bacteria in a bottle dont contain live bacteria.
There really isn’t a wrong way to do it, I prefer patience over speediness, though. Just the other side of the coin so to speak.