Concept: Laptop or Android tablet --> USB - Serial adaptor <--> ATtiny13 at 3v3 <--> SX1276?

The BusPirate will let me play with the SX1276 registers and do some initial set to work, but even using macros or the built in Basic will get a bit tedious for more serious stuff. The first proper fencepost station will have a 3v3 Carambola2 but its not really useful for portable debugging. When we get to building and tweaking antenna and trying to get range, it will be handiest to be able to hike around with my trusty AspireOne or a tablet...

At around $1.20 I may as well buy a couple and see if it is possible to cram a very simple serial port register translation and data transfer protocol into 1k of flash!