https://www.google.com/search?q=svg+to+dxf+command+line yields

inkscape --export-type="dxf" input.svg --export-filename=output.dxf

At which point it is just bash scripting, for loops, and printf/awk. Which… is a Thing but it is also a Thing you only have to solve once (and actually is great fodder for LLMs).

I’ve seen differing reports on that one. One Q&A with a google rep that made it sound like android studio (? The IDE/toolkit) could still do whatever without a key but with a lot of vague reference to other modes and programs.

Which, to me, reeks of “Sooner than later, all devs will need a key”. Because if it were really that clean cut, they would be screaming it from the mountain top.

Is this manageable for the non-dev by chance?

Not really.

I’ve not been following things super closely, but the idea would be that each user would get their own developer key and then locally compile and deploy whatever apps they want as though it were a project they themselves were working on. The first bit is not too dissimilar from how a lot of people with XBOXes made dev accounts to install emulators. But the latter is going to get real messy and REAL compromised REAL fast as people just use third party tools and binaries that will inevitably be compromised.

I’m feeling a dumbphone alt may be the only viable path

It really depends on what your use case is. If you actually just talk to people on phones? Uhm… I am not even sure where you would find a dumb phone at this point, but that will probably work for voice calls and SMS using just your carrier and MAYBE wifi. But anything that involves apps, which is a shockingly large part of the world, will be a mess. Some you can (and should) do workarounds (banking apps, for example) but others you are kind of up a creek since your options are to use a modern phone or not be able to (for example) see your kid’s daycare schedule.

Theoretically, you can mold it to fit your hand but the tolerances and mountings make that a hassle.

As for the print itself? Most people just do a quick print and have the telltale ridges from layers. But you can futz with settings to improve the smoothness or just finish the print itself. At which point it is not going to be as smooth as injection molding but it will be more “different” than “bad”.