I went through a training process with Cookie that proved to be a success after only a couple of days. Before I went through this process Cookie did eveything he could to get back on the ground. This process is similair to what your vet recommended. This is how the training process worked:
I caught Cookie when he was very relaxed and I put my hand under his front legs. Then I did this many more times applying more pressure every time. Then I got to the point where I was able to lift his upper body up in the air then set it down. After all this I gave him a treat and lots of praise. The rest of the training has to be done at your rabbits meal time. Put your rabbit’s meal somewhere where you have access to it and not your rabbit. Next, I gave him a pellet or a peace of his veggies and did a lot of petting. Then, I started from where I left off, slowly lifting his upper body then setting him down, extending the time with each lift. After each time I set him down he would get a pellet or a piece of his veggies. After a little bit he realized that every time he was lifted he would get a treat. I later moved on and would pick up his upper body and add pressure to his back legs. I then got to the point where I was able to pick his whole self into the air and then put him back down. At this point I would give him more than just one pellet or one peice of his veggies! Then I got to the point of picking him up and holding him to my chest, then on and on, until I was able to carry him out of his pen and around the room.
Make sure you split the process into a few days work. End on a good note for every training time and give him or her the rest of the meal. I hope this helped make your own ideas to create your own training. I had the same feeling when I had to give Cookie his antibiotics. But we still kept the same bond.