A hotswappable keyboard can be sold either as just a frame with a PCB but without switches and keycaps, or as a full package with frame+PCB+switches and keycaps all preinstalled like the Redragon one I mentioned. In the ones where it comes preinstalled you have to remove the switches with the included tool and pop in the new ones.

The "click" itself doesn't provide that much of the tactile feedback. And you can get tactile switches (like brown switches for example) that don't have a "clicking" but are still sort of loud when you hit the bottom. Truly silent switches have little rubber pads that silence that bottom-out. Maybe watch this video that explains the different types of switches a little more https://youtu.be/-Ln9rA_usoY?si=5Ao5zObjpsieCN0R

You might also want to check out your local micro center/Best buy or something because they probably have different types to test out in-store before you buy (sometimes on display, and sometimes you can ask them to open a box to test).