If we want to protect community , we have to do the work. I choose to be the gatekeeper, not just the vault.
I have gone through your model and it is honestly trying to do something different, but it needs to be heavily refined. The current model might sound cool but I don't think it's the best we can have from it. For instance;
Batch Execution: By splitting a large transaction into smaller, manageable chunks (for example according to security deposits I have $2,000 - with $10k I split into 5 swaps), I limit the blast radius. If the service stops responding, the remaining pending swaps remain in our control, effectively protecting the user from the full loss.
I don't know if you considered a time factor here. If I am to swap $10k worth of coins, I will have to wait for 5x time that I needed to wait for a single transaction. The network fee, if there's congestion and more. This means I'll likely use a whole day for swapping.
how would you prevent the scammer from reclaiming their own escrow fund via fake victims and fake valid letter of guarantee ?
Your won model do not also address this concern.
Addressing the "Exit Scam" Risk: To prevent the scammer from reclaiming their own escrow via fake victims. Since I am the active intermediary, I hold the "source of truth." I do not need to rely on users to report a scam. If anything goes wrong, I will make everything public and create scam accusations.
Does holding the source of truth mean denying someone with a valid letter of guarantee compensation because you suspect they are fake?
What other measures will you apply?
I suggest that if a BTT member is holding an escrow, a percentage even if less than 25% should be set aside for forum members.