Buying a different brand octo has no effect on your warranty.
As new divers it's easy to believe Parts for Life marketing hype but don't let that be a factor that pushes you into more expensive all one brand gear purchase since labor is 80% of reg service cost and not covered.
As for
Pink...
A friend of mine dives as much pink as she can get. LP (reg hose) is available in normal or Miflex. Also there's a pink mouthpiece available for Scubarpo since they use a slightly different diameter than some other brands IIRC. Atomic even has pink accents for their regulators, you change the purge cover, knob and exhaust ports with a kit.
A black HP hose can also be wrapped in a pink spiral hose wrap - costs $2.00 I've never seen pink HP hose but I don't look for it either...
Sea Elite Spiral Hose Wrap 48in
My friend has a pink framed mask, pink bladder on her BC with pink fabric inserts on a black jacket, solid pink fins (easy to spot her) and pink wet suit and boots All her hoses are wrapped. She even has a pink handled knife and her computer is white.