For our RTC QT breakouts, we want to add a coin cell holder on the back. I like these bent metal ones, they are inexpensive, easy to pick and place or hand solder, and are incredibly durable - they don't corrode or get loose over time (and if they did you could bend them right back!)

See them at https://www.digikey.com/short/h9fp34qj

Also, thanks to Jeff Epler for pointing out a nifty 'lead time trends' page over on https://www.digikey.com/en/resources/reports/lead-time-trends you can see the effect of the silicon shortage on the 'Microcontroller / FPGA' section!