Looking at the excellent Eclaire XL mini, the only part I don't care for is that it uses a USB keyboard connector. (An Atari adapter may be available later.) I want to install a Eclaire in an 600XL or 800XL. A "sleeper" of sorts.
A proposed solution is the Tynemouth Software Atari to USB adapter. There are Tynemouth adapters used for Retropie and other retro computers, so it is a relatively common solution for older computers. But the rub is that it is $80 including shipping. Not the end of the world, but pretty steep. This is similar to the issue of attaching an Atari keyboard to a PC which has been discussed in earlier threads.
So, is anyone aware of any possible alternatives? Arduino? Raspberry Pi?