Thanks, Colin and rpcrowe, for swift and useful replies!
Colin, you're right about my kit lens, and you're even right about my second lens, the only other lens I have purchased so far! Unfortunately, my 70-300mm lens is without IS, but I'm saving up money
The manufacturer of the Nikon-Canon lens converters also claims that focus confirmation works, as Colin supposed it would. I think I might give it a go, as it's just about $80 anyway - and then I'll be able to test the f/1.2 prime and f/2 macro lens available from the Nikon kit I was offered *excited*. These lenses also match the "criteria" rpcrowe suggested, and manual focusing is okay for me, particularly when it comes to macro photography.
I'll get back to this forum with my opinions on the converter when I know if the whole thing works okay - to share my experiences, so to speak! In any case, it will be an interesting experiment!
Thanks for all help and info!