Thanks.
We did the blanket over the play pen and he seemed to appreciate it.
We tried to let them interact a bit as you suggested, but the girl attacked him! We started out with their cages side-by-side so they could see each other, and they obviously knew who each other were because they were practically climbing the bars to get to each other. But when we put them within physical proximity, she attacked. It must be that he smells different (particularly the splint, which smells like a vet clinic).
Now they are in separate cages, about 2 inches apart, with a blanket in between them for parts of the day (we lift it for other parts so they can see each other). They each have a fleece blanket in their cage and I’m going to start swapping the blankets out every day so they will have each other’s smells in their respective cages. When he goes in for his 2 week check-up, I’ll take her in a separate carrier so they both come back smelling relatively the same. They will probably have to go through the bonding process again when he is all healed up, but I’m hoping these adjustments will make that easier/faster.