Installation questions - pro2 doorbell

Hello my friends, I got a brand new pro2 doorbell and I want to make sure I install it correctly so please allow me to ask a question: First, instructions say to install the Pro Power Kit v3 to the chime. Well, my chime is not one of the boxes that sticks out into the hallway, it’s actually behind a plate inside and flush with the wall. The space is VERY cramped. But can I do this instead? In a little cabinet right next to the front door is [this scene](https://i.imgur.com/9RV2d4F.jpg). The wire going to the top left is going to the door, like 3 feet away. The wire to the right I assume is going to the chime which is like 50 feet away. The confusing part to me is that [the wires](https://i.imgur.com/swrXa04.jpg) are kinda spliced and twisted all up. Would it be ok to connect the power pack right to the transformer? Or somehow otherwise splice it into some of these wires? I know I could pay someone like $100 to come do this but I like to learn, if some of you kind folks would help me out a little. Thank you!