TBH maybe you're overthinking this. A reliable stay is all that's required with the emphasis on reliable which means making sure pooch doesn't move away until you release him/her. Then, it doesn't matter where you are... I used to leave Jack in a stay in the garden and go inside and watch him through a window to see how long he'd last. When he could do ten minutes I cracked before he did. Also useful technique for initial recall training though obviously the stay only needs to be long enough to get inside... Much harder to do a reliable stay, or recall, away from home with many more distractions, of course.
I have nothing against using a clicker, but I do/have done all my training without one. Just personal choice. I found I was always losing, treading on or forgetting them. I prefer to use an emphatic 'Yes!' instead.