With regards to the LOE issue once you have a trip, it's your trip and that should be inviolable. If the company wants your trip they can pay you to stay at home, or if they assign recovery flying the ENTIRE new trip should be treated as a reroute and paid as premium pay.

Another option is to make it up to the original trip holder whether or not to release the trip for the LOE. It's his or her trip. The bid it and got the award based on their seniority. If the company wants it, and they want to apply recovery flying it's "let's make a deal time". The recovery trip is a better deal, or find another trip for the LOE.