We need an AVR programmer.

We need an AVR programmer, a USB.
There are a lot of my fencing machines scattered around the market. The International Federation has changed the rules. We need to reprogram them all so as to prevent the possibility of unauthorized replication of programs.
A programmer in a faraway place receives a headscarf from me without a case - a programmer, by e-mail - a file, uploads it to the programmer, disconnects it from the computer (you can not turn it off) and programs the requested number of devices.
The programmer stores the file number so that it cannot be reused.
Gotta:

- selection of element base, development of sketch SSE, programming, debugging
Preferably based on AtTiny 2313 – there are ready-made programmers as a first step
Two goals (two MS ATmega8535) programming
- Controller for each channel + Controller
- Channel switch button
- Indicator of the remaining amount of programming (only when connected to the PC)
LEDs: power supply, programming flow (completion of current programming), programming channel,
- SSB food.
The program on the PC can be started by the command line.