rockm

"I was also hoping to be able to keep it at my desk so that i dont forget to take care of it and more likely to fuss over it, with it being 2 feet away from me throughout the workday."

You will kill it doing this. This is how the vast majority of first time bonsai are killed. Too much care.

Plants have withstood humidity, wind, sun and rain for about a billion years--they require it all.. Sunporch is too shaded. Find a place that gets Full sun in the morning. Shadier in the afternoon. Put the plant there and leave it.

You grape is a bonsai. Basic bonsai care applies. You're making this too complicated. Grape is not really a special case.