I plan on getting Rhinoplasty/Septoplasty, will I be able to train Brazilian Jiu Jitsu again?

I don't think it makes a difference if you see an ENT surgeon or plastic surgeon for a septoplasty.  It's more important to find a surgeon who is comfortable with rhinoplasty surgery and understands your goals.  There are good and bad rhinoplasty surgeons in both fields.  

Your nostrils likely can be altered using alar wedge excisions, which remove wedges of skin in the groove where your nostrils meet the cheeks. The scars heal imperceptibly.  You should consult a pastic surgeon with extensive rhinoplasty experience together more details on your options,

In general, the final result of rhinoplasty is not evident for 18-24 months after surgery. 70% of the swelling is resolved after the first 3 months and the remainder goes down over time. You will still have swelling after 5 weeks that can affect the appearance of your result. Swelling can be...

Thank you for your question and photos. At 9 months postop, it is still possible to still have swelling of the tip of the nose.  This and the normal postoperative sensory changes are probably contributing to the feeling of hardness at the tip.  The hanging columella...

It looks like you could have steps taken that would alter your nose towards the shape Megan has.  Some tip cartilage refinement looks likely, and could be done with either an open or endonasal approach.  I would suggest endonasal.  However it also looks like Megan's nose is just a...