I'm currently working on a project that involves multiple Atmega devices. I'm planning to leave ISP headers on the board, but I don't want to leave 1 set of ISP headers for each chip (I'll have 4-5 of such chips). But instead, I'm thinking of cleverly placing jumpers and headers as to "select" the device being programmed. This way I get to use only 1 set of ISP headers.
My question is which ISP line can I select for muxing. ISP lines consist of the following
VDD GND SCK MISO MOSI Reset
My guess would be if I disconnect SCK line for the 4 devices that I'm not programming, but connect this line user a jumper for the device that I am programming, then I end up with programming this 1 target device. Is this a feasible idea?