What is better? To make gameplay a little easier for newbies (even if they can just visit Sarna) or to follow the rules of the universe on which based the whole game?
Also I thought that 'AS7', 'BSW' or 'OSR' sounds like 'Atlas', 'Bushwacker' and 'Osiris'. So it will be:
'Atlas B in Delta 4' vs. 'Atlas K2 in Delta 4'.
Anyway it will sound like that:

- Got a contact! Atlas!.. O_o'
- Where??? 
- [fight sounds] Sh*t! He's got that heavy gauss! D:
- Where he is??!! 
- Dammit, he legged me! Argh, I'm ejecting!.. 
Next, every customized variant should identified as 'Customized' or 'Unknown'. I think it will be the best decision.
But yes, this pattern allow you to create any different variants for balancing purposes...

And nobody will says: "Hey it's not a BSW-X1! It's absolutely not!"
