Honestly, I don’t think the 20-minute “security” barrier is an barrier at all. You really think without more people would use it, why? If you understand or know why it’s there, you can deal with it. And if you really need multiple transactions in a short time, then using multiple wallets or sending transactions to yourself between two wallets and different addresses seems like an acceptable sacrifice, like you have written. But still, if they improve it, all the better.
Nice blog, nice sheets. Still try to understand everything!