If that happens I will need to spend a full half of a day to collect addresses, check which ones were deleted and then again one by one I will need to sign and broadcast.
You don't need to do anything like that. Just save all your unconfirmed transactions in separate files, and if they get deleted after 2 weeks, re-broadcast them. (Not sure, but I think Electrum will store them in your app data by default if that ever happens, but do the process yourself to be sure)
That are your campaign paymets? In that case is not possible to accelerate them 
Yes, they are. I tried viaBTC but it always exists the size limit unfortunately. I wanted to check their paid service but it seems for their paid service for each a transaction they charge over $200 LOL. I don't see no point to spend that much.