I suggest the now inchoate but cognitively percolating Downtube design-around of a brommie ("DT-B") have two folding points (the primary inventive step of the Brompton design), be aluminum and titanium (Volvo survived by going premium), and be sold initially as a frameset with a threadless headset (a la Swift) and a 130mm OLD (road bike hubs) in the rear dropout. Two folding points = pivoting rear triangle AND hinged maintube (hinge near the handlepost). Use the existing, excellent "Chinese hinge" as found on the existing DTs, not the value-engineered copros on the small Dahons.
For the full suspension model, use a plate or thin wall channel titanium swingarm with detachable shock. The biggest barrier to packability of the DT is the width of the swingarm. Offer various grades of shock and forks, as is done with high-end mountain and DH bikes. Let SB11, me, and the many other builders on the forum get our hands on the frameset as "product developers". If Yan can negotiate a Taiwanese (e.g., SA) or Chinese gear hub deal for a narrower OLD and BB, a second version becomes available with a 20mm narrower rear triangle, gear hub, and 10 mm shorter BB width .... but don't hold back the DT-B project waiting for a 100 mm gear hub.