I'm not sure I understand.
You launch a DAC,
either it is the final product, e.g. dnsDAC,
or it is a proto-DAC, e.g. proto-dnsDAC,
If it is a proto-dnsDAC, it can be POS/POW/Mixture;
In either case you can,
1. "premine,"
2. allocate to PTS/AGS
3. whatever
So now you got a proto-dnsDAC, and you want to launch the dnsDAC,
First, how many percent of the dnsDAC are allocated to proto-dnsDAC holders?
1. x percent to proto-dnsDAC holders.
2. y percent to development.
3. z percent to promotion and givaways,
.. etc.
Second, how do you allocate shares from the proto-dnsDAC to the dnsDAC?
1. Snapshot,
2. Proof of burn,
3. Angelfund,
4.
..
As you said, if the proof of burn is uniquely possible by burning proto-dnsDAC shares, then this is similar to doing a snapshot from the proto-dnsDAC. If you're doing proof of burn or angelfunding, then you can allow contributions only from burning or donating proto-dnsDAC shares.
Finally, just to mention the cool idea you introduced, if you hold a slice of the proto-dnsDAC it is possible to promise people payment in the shares you get when these proto-dnsDAC shares produce or can be redeemed for the dnsDAC shares.