PureOS has minimal differences from Debian in that they (a) remove all non-free components to get the FSF endorsement and (b) add not yet upstreamed drivers and

PureOS has minimal differences from Debian in that they (a) remove all non-free components to get the FSF endorsement and (b) add not yet upstreamed drivers and features, https://puri.sm/posts/how-to-be-upstream-first https://puri.sm/posts/how-to-be-upstream-first. So Debian should work sooner or later.