Was just gifted a few old iMacs, worth trying to upgrade?

[PeterB]

Hmmm, interesting. I'm wondering though if the cheapest/easiest solution might be to use an external SSD or even a flash drive?

How about something like one of these?:

https://www.amazon.com/dp/B0CM8XN28G/
https://www.amazon.com/SanDisk-512GB-Ult...083ZS4HYD/