My Five Year Old Puppy

Having adopted both of my dogs from shelters, I've never actually had to deal with the puppy stage. Both of my dogs came house trained, both were able to be left alone inside...well, mostly. I mean, Midas has never exactly done "well" when left home alone, definitely seems to have some separation anxiety issues as he is only destructive when we are gone. He has done a lot better with this since we got Lucy, and he has us well "trained" to not leave anything that can be shredded out in the family room with him. A new issue has come up this week - scratching. Apparently Midas thinks that he would like to spend some of his day in the office...the one room on the main floor of the house that he can't go in during the day. The office also contains one of the nicest architectural features of our house - arched french doors with 15 little windows in each. In Midas' quest to get into the office, he has really scratched up one of the doors. The doors have always been there, but this week apparently the office quest began.
I considered several options of what to do about this. 1) Get a large crate and lock both dogs in their crates during the day...we have one for Lucy, but we don't have one large enough for Midas; 2) Make Midas wear little booties on his front paws so he can't scratch things...he would look just ridiculous and I can't imagine he would just let you put these on without a fight; 3) Put up a gate to keep the dogs in the kitchen during the day...this, however, would require a way to put their beds in the kitchen which I'm not really sure where I could put them; 4) Put up some kind of plexiglass shield on the office door to prevent any further damage...they sell these, but they are not very attractive and it really doesn't do anything to teach him not to scratch; or 5) use indoor zones that work with the shock collars they already wear all day. This is the option I think we are going to pursue first. We never bought any of these for indoor training previously, as we wanted the dogs to feel safe in the house, and not cause Midas any anxiety (he's somewhat fragile). They both are fully trained on the outdoor fence and also respond well when we use the remote control when people are over. So the zones are essentially a round disk that is battery powered that you can put anywhere and set the boundary from 2 to 12 feet. Essentially we would put one in the office and when he got too close to the office it would beep and/or shock him. When we were home and the door was open, we could just turn off the zone and he could come and go as he pleased. So we'll see...I was pretty mad at him yesterday, so if this doesn't work I think I'll continue to work my way through the possibility list.