How does one practice Buddhism when experience is limited by the 6 senses?
If you're eating a grape and you are thinking about the soil and farmers and so on, then you are not eating the grape, you are thinking.  This isn't mindfulness.

You don't try to be interconnected.  You let go of all the conceptualizing that infiltrates experience.  The idea here is that your concepts are the thing that blocks interconnection; let them go, and there's interconnection.  You needn't develop it, you just need to remove the barriers to it.

Ironically, one of those barriers is precisely the exercise you mentioned.  Your thoughts about how you are interconnected to that grape is exactly what's keeping you from really being connected to that grape.

You don't connect in an ecological or social sense, but in an experiential sense.