A/C Drain Cleaner Question on 2008

Hello. I am working on a project 2008 Tundra with the 5.7L. On my long list of maintenance tasks is to clean the AC drain. I had a kit off Amazon with the cleaner and hose but little did I know how difficult it is to reach that drain over the transmission. Plus, the hole is too small for the hose that comes with the cleaner to fit. I even tried to get a drill up there to widen the hole just enough to get the hose in but I had no luck.

So, I wonder if there is a spot I can inject the cleaner from inside the engine bay or the cab to clean and disinfect the AC coil in the dash? My hope would be to inject it, let is sit per the instructions on the box and then it would drain out the condensate drain like normal condensation would. Anyone have any advice on that?

Thank you.