I would probably recommend and OWC TB4 dock and OWC Thunderbay 4 (DAS). This will give you your single cable solution. The dock comes with the cable that you need, you may need an adapter cable for the monitor if you don't already have a TB/USB-C cable there. I would advise running at least 16TB in the DAS/NAS, so you can run in RAID 1 (to get 8TB mirrored). Keep in mind you'll need to upgrade all 4 drives to increase the storage. This is ideal if you're accessing the storage mostly via the attached workstation. If you want storage accessible throughout your home, you may want to look into a NAS. I'm not up to speed on what NAS works best with MacOS, but I know some can be finnicky, so be careful if you go the NAS route. If a NAS/DAS is way out of the question in terms of cost, you can always buy a couple WD Elements drives (use one as primary and one as a backup). I use Cronosync for backing up external drives this way. Cheap and effective.
Add three Thunderbolt ports, 4 USB ports, along with Ethernet, audio, and card reader functionality to your Thunderbolt-equipped Mac or Thunderbolt 4 PC.
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The ultimate Thunderbolt RAID Storage Drive for creative workflows. Perfect for handling 4K video, audio, and photography with confidence and speed.
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Western Digital elements desktop storage with USB 3.0 offers reliable, high-capacity, add-on storage, Fast data transfer rates and universal connectivity with USB 3.0 and USB 2.0 devices. The sleek design features up to 14TB capacity plus Western Digital quality and reliability.
www.amazon.com
ChronoSync is a complete, all-in-one solution for file & folder synchronizations, incremental backups, bootable backups (a.k.a clones) and cloud storage. In use by thousands of photographers, video editors, filmmakers, musicians and other data professionals. No other app can compare!
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Nuphy sells various styles of mechanical keyboards that are popular among gamers and programmers. Users can choose from a variety of switches that differ in resistance, tactile feedback, and noise level.
nuphy.com
There's nothing wrong with the Magic keyboard (except cost maybe), and I actually prefer the Magic Mouse for Mac. I know you said that you have a mouse, but I really like the Logitech M590 and use it for PC stuff, so you may look into that one as a potential alternative to the MX Master 3 if it ever dies on you. I would also check out the Nuphy Air75. I wanted something a little different than the Magic keyboard, and I'm loving these (have two of them). Similar profile to a MBP keyboard, mechanical feel with a little less travel, supports up to 4 devices, but you lose touchID obviously.
