I dunno if is possible or not but if it is, i think should be interesting, since there are a lot of open source apps https://open-store.io (be carefull there is also proprietary apps) but if it’s easy to port the apps or the store itself should improve a lot the apps available on pureos store on librem5.
There is already apps like nextcloud, linphone, youtube/reddit/twitter viewer, there is other matrix and xmpp clients, protonmail and tutanota and a lot of other interesting apps.
I’m not a dev, so i dunno if porting things from ubuntu touch to pureos is something like a couple of click or if is faster to write it from scratch, i’m just sharing an idea, probably bad but i do 
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