This is complicated though because “talk” (vanilla voice calls) and SMS/MMS are inherently insecure. The truly security-conscious person would never use either voice calls or SMS/MMS and would instead only ever place data calls and then layer appropriate secure protocols over the mobile broadband connection. So you may need to spell out what functionality you really want.
Nevertheless a “5 Lite” is certainly something to talk about. Talk is easy. It may be better informed once we have the “5” to play with.
Generic wish list topic is here - Your Purism products wish list
My understanding is that the one card does both WiFi and BT. So it would cost money to remove BT, at least in the short term, while developers qualify a WiFi-only card etc.