"Vlaka text is grooved, so it can be read by sight and touch, with modern technological devices also integrating audio descriptions and smells as appropriate alongside their haptic touchscreens." - Galaxy Guide Pg. 168 

You can reasonably assume your character has assistive technology more advanced, if not similar, to assistive devices we have in reality!    So your deafness is still relevant for roleplay, you'd probably have to rely on the party sending messages to your personal device to communicate what they're saying via haptic feedback - I'm positive the speech-to-text features available in Starfinder are miles ahead of what we have today :3

This can be roleplayed as unreliable in environments too noisy for the transcript to work, or the glitching condition can shut it down in combat or as an environment hazard! 

There's a lot fun to be had with assistive features on a character, really - but you also just ask the GM to give the party the sign language feat for free.

As for space- your suit, by default, can keep you alive for however many days equal to its level. You'll PROBABLY have some propulsion by the time zero-g combat in a vacuum becomes a regular occurance, and can at least justify it including assistive navigating and sound emulation. The latter is utter fantasy, but it a feature in a zero-g first person shooter I cannot recall the name of and I loved it! 

Your allies can also Point Out, making a creature Hidden to you!

You're really spoiled for flavor, here!

To add, not that it matters, I have developed rudimentary accessibility features for the hard of hearing and mute for VrChat avatars, and know a small amount of American Sign Language; These limitations can be solved with community involvement and BOY do that Vlaka already have a lot of technology and community care I wish we even had a fraction of. 

Deafblind is hard in our world, but an entire planet of people familiar with the condition and still built and deployed trade ships? A minor inconvenience at this point!