Hi Shazam,
i’m also willing to help in the DSO hardware redesign. This circuit could be a nice start, as the battery charger is a weak point in the DSO nano. Probably, the only drawback of this circuit are the switching times due to capacities and the dropout voltages when the battery is low (as XC6203 needs at least 300mV@200mA) . But, i don’t know if people at seedstudio are capable to test the proposed solutions (Freezing, ESP… any feedback?).
Slimfish