If you’re going to install it with Xfce or something, you might just do it then.
I’ve had the option to create swap, and I did. So I know it’s there in installation. Although, AFAIK you can do it from your machine as well. See:
https://wiki.archlinux.org/title/Swap
Edit:
Otherwise, there’s also the Lxqt Community edition by @Jim.B, which AFAIK is rather lightweight, so more resouce-friendly than Plasma:
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