I need to replace my iMac but Apple's options aren't suitable

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I’ve got a 30" Dell monitor attached to a 2017 MacBook Pro. Recent thread:

How to connect Apple 30-inch Cinema Display to USB-C at high resolution

Having just got my new 2020 27″ iMac set up with my old Apple 30″ Cinema Display connected as a second monitor – no trivial task – I thought I should leave the instructions here for anyone else who wants to do the same. Here’s what you need: • A free USB-C port on the Mac. • A USB-C to Mini Display Port adaptor (around $15). From what I’ve read, this needs to be able to accept input from an active (externally powered) DVI adaptor (evidently some don’t). • A Mini Display Port to active dual-l…