I've got a few different sets of sticks I use but favour either a modified set of Limulus's sticks or the Knobloch sticks. Because the Knobloch sticks are collapsable they can be stowed by attaching to my roe sack leaving my hands free. If I needed a set of collapsable quad sticks I'd be buying a second set of the Knobloch & lashing them together; this would give you the added flexibility of just using a good light pair of twin sticks or setting up for quad sticks, both of which would work very well for standing or sitting shots. They are very well made & the legs have 3 sections, allowing them to collapse to a useful size. Hunting Solutions on here sell them.
It's not the cheapest option but it would be the most flexible. If you find the option of making minor adjustments to the front end of the rifle without moving & resetting the quad sticks (as per the Hammond ones mentioned above) attractive try holding the conventional sticks differently; grasp the front cross with your left hand (assuming right-handedness) & lay your thumb on top of the cross, your rifle on top of your thumb & the 4 fingers to grasp the sling & sticks; it should allow you to move the rifle a small amount left or right. This position also would help if 'bounce' from your stick/rifle combination is an issue. African PH's always seem to recommend your entire hand between the sticks & the rifle to soak up bounce. Might not work so well if you use one of these vulgar bipod thingies though.