So, just to be clear.
By tinkering you want to manually turn your CO2 off every night and on Every morning before the lights come on? Because if you are thinking you want to get a smooth constant flow so you don't have to change it, it won't work that well.
It might have the appropriate amount of CO2 in the morning but it will not keep up with your plants during the day. This an electric one for Paintball tanks.
This is more like what you're looking for probably. co2art is good for this stuff, quality parts for sure. Looks like you would need something else for this though as I don't see where the air line would go. But still, co2art is my recommendation for quality parts.
I feel I should mention, I have no hands on experience with any of these products. I did research it at the beginning because I have an affinity for paintball. But I ended up going all the way and am very happy about it. The life time of a good tank is 5+ years. you'd have to turn that sucker on/off each day for 5+ years. Just food for thought.
Good luck!