I remember doing this before with an older Macbook Pro that had a motherboard failure and now keep the HDD from that in an enclosure as my time machine backup.
It’s probably worth upgrading the SSD, though I feel I should really upgrade the battery and a blown speaker at the same time.
My battery is actually eligible for a free replacement, but the hassle of sending it away for a week when I use it for work has stopped me from doing that. Probably easier just doing it myself.
Thanks so much, I’ll look into this!