Hi, it’s almost a month by now, so if her incision site looks healed, I would say it’s safe to start. If her site is still red, swollen, or in any way giving her discomfort (or just doesn’t look right), you should take her to the vet to be checked because that would be an issue of its own and has nothing to do with bonding.
That said, if you begin bonding slowly and supervised, I think it’s safe to start. If Bear’s neuter had been sooner, it might be more risky, but he is well over the first month after his neuter, which is when his hormones can still be active, so even if she has residual hormones, she cannot get pregnant by him now.
You can read up on Bonding advice in the Bunny Info. section (see the drop down menu above) if you want some help starting. Also, the Bonding section here has loads of advice from folks with experience. What to watch for is preventing any new injuries to either of them if it doesn’t go well. Just remember, humping is their way of exploring dominance, it’s not necessarily harmful. What you need to prevent at all times is either one of them humping a face instead of a rear end, because she/he could be bitten in the sensitive area if that happens. That may be the only risk to her incision site in a bonding attempt. If you want to, keep them both from humping for a few more weeks and just have very limited time together to see how they behave. Indifference is a good sign. But if growling and biting occurs, be ready to separate, have something like a handled food strainer to drop between their faces to stop biting, and be gentle when you handle her because of her healing area.