Hi there, welcome
You can pre-bond now if you’d like, but I would probably wait to do pre-bonding and all that until Hummus (cute name!) is neutered/spayed and hormones have calmed down. I say this mostly out of laziness because you’ll want to restart the pre-bonding clock anyway once he is fixed, since he will smell differently once hormones kick in, and once he’s fixed they will change again. Plus, if Hummus is female, you’ll have to wait a several months to spay, so it could end up being a LOT of pre-bonding….. So personally it would be easiest to just wait until Hummus is spayed/neutered and really ready to bond.
I do think it would be fine to have them side by side though, as they might enjoy each other’s company as neighbors. I wouldn’t let them physically interact though. Babies do usually get along with adults, but you never know when he will hit puberty, and fights can happen kind of out of nowhere. So, there isn’t really anything gained, and there is a lot of risk.
You can start scheming now to have a good neutral space in your home to do your eventual bonding sessions in.
Just another two cents, 6 weeks is very young, as you know, so it would be good to have a check up with a rabbit savvy vet to make sure lil’ baby Hummus gets everything he/she needs. 
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.