I mostly agree with you but I don't think the proposal adds significant complexity. We already have conversions in one direction, it is actually a bit more complex to explain why it can only be done in that one direction and not the other (I have been asked this multiple times).

I am strongly against feed premium since it harms the community members when they convert SBD.

I agree that harming community members is bad. The problem is that the high SBD value harms community members when they convert, and by not addressing it we are contributing to this harm by inaction. At least two community members converted $200 worth of SBD today alone, each is losing about $100 in the process. The faster we can reduce the high price of SBD, the faster we can stop this from happening. It has been going on for several weeks and community members have been hurt doing this almost every single day! (Thankfully it is now less than before due to education, but that isn't perfect.)

losing perks for authors

I think we can get much the same benefit without the disadvantages by shifting demand to STEEM and raising the STEEM price. This also reduces the debt concern (maybe not on net, it is hard to say).