I finished the 2nd version of hot socket tonight. I am including two ZIF 28 pin sockets. The right hand one will service ATmega328’s. The left one will service ATTiny 85’s at the bottom, and ATTiny2313’s at the top. The board still has a 6 pin ISP header to program units that are in the system.
It should be drop-in compatible with a USB Tiny ISP, but make it easier to program chips that are destined for kits or other projects. I should have a functional prototype in a few weeks.