First I don’t have or use whatsapp. But maybe you need the play services to get whatsapp working on LineageOS

ISS detector pro

Fairemail can still not compete with K-9, besides that the premium version cost €7,49 while K-9 is still free

You can stall it without a ms account and only a local account. You need Rufus to create a new usb stick. https://rufus.ie

SMS is the only universal messaging protocol, it works on EVERY phone instead of only smartphones. Besides that, why would you use a a messaging app owned by a data grabber / privacy violater.

So far so good. Same options as QKSMS. Tried fossify before but that is not even near QKSMS or QuikSMS

None is not right 😋 I have an old Motorola E 2nd gen running an unofficial LineageOS 17 24/7 on external power thaf I use as an automatic phonerecorder on my landline. Battery is not swollen. There are probably more phones who can do this

Not very good. On my Moto E32 it’s not possible to create a password for the encrypted database, the field were i have to confirm my password is unreachable.

Or XMPP