Transaction Ordering and Payment Post-Ex

Hi all,

I have two questions, which I think at some point u/vbuterin et al might have answered already, so, maybe someone can point me in the right direction, or help me brainstorm on them ...

Transaction Ordering and fixed price transactions.

Let's say, I want to model a layer 2 network with fixed price transactions and do a simple FIFO model for transactions, instead of a gas price auction. It would lead to first-come-first-serve, eliminate the front runners, but most likely introduce other problems. I would be interested if someone already worked out, on the theoretical side, which downsides this would have against the gas price auction model. I tried to sift through reddit, the greater web and ethereum-magicians, but nothing came up.

TX Payment Post-Ex

Let's further say, I want to deduct the transaction fee in this hypothetical layer 2 chain post execution. This would enable that smart contracts pay, with certain accuracy, for the transaction itself. For example, the classical "how can I convert my weth to eth if I don't have any eth" would be gone. On a node-operator level it would probably introduce DDoS problems and maybe also a lot other problems down the road. Was there maybe already some discussion around this topic somewhere?

Again, I tried to find something on reddit/ethereum-magicians/etc. But my search mostly brought up issues around EIP1559 etc.

If anyone knows a paper, article, blog post, or any work around these two topics, it would be highly appreciated.

Thanks

Tom.