Transparent ... Never sell more than 0.025% of total supply in a week.
Unobtanium would be maybe a coin to look at
You want to attract miners that believe in the coin and hold it.
If developers can fund themselves through other channels than selling at least for a year
Your first suggestion sounds reasonable, I will propose this as a rule for Bitmark.
I will take a look at Unobtanium.
Attracting the "right" miners until the coin has a strong hashrate is very important, it is my main concern. We will see what happens.
Funding through other channels is ideal, but it also can detract from the project development as you said earlier.
Distributed risk seems to work to some extent. For example I needed to raise 0.6 BTC to get resources for bitmark. A few donations of 0.1 average came in, no single donor spent more than they could reasonably afford to lose, and they did not need to take a big risk of trust and belief. Some IPOs seem to work the same, with many buying a small amount.
Speaking for myself, we never know what will happen in life. So it is possible that at some time I will require money to live due to something unexpected. At such a time the issue would be whether to put it to the community transparently, or whether to commit to taking a break to work on something funded. The problem with taking a break is that it can lose momentum and create negativity, forcing prices down, and making it harder to return or pick back up. The problem with the community reliance is just that, there are very few people who are happy to donate cash on the hope that it will increase or maintain the value of an asset they hold (the currency in this case. It is ideal to have emergency funds or reserve for an event like this, but after working unfunded on something for a long time most people would not have an emergency fund left.
I can see you have put a lot of thought in to this, thank you.
edit:
edit: maybe make a second disconnected coin to capitalize on and leave your main project pure to help it succeed.
I will think on this more. I considered it and have forked the project to create "Pfennig" a clone-able version, but I felt that creating a coin with no intention of creating long term value or support felt ethically wrong, it would be unfair to those buying the disconnected coin.