I’d group them first by omni versus standard mechs. This way, you you have pure omni stars for BA mechanization in novas when you want that.
And then I’d group them by speeds bands, like...
Assault Stars: 3/5/X to 4/6/X
Battle Stars: 5/8/X to 6/9/X
Striker Stars: 7/11/X or faster
This minimizes stars with widely disparate speeds.
Doing these groupings gives you the following stars. I tried to minimize duplicates in any one star.
Assault Star (Frontline, 3/5/X to 4/6/X)
Deimos
Kingfisher
Executioner
Nova Cat
Loki Mk II
Assault Star (Secondline, 3/5/X)
Supernova
Marauder IIC
Highlander IIC
Thunder Stallion
Rifleman IIC
Assault Star (Secondline, 4/6/X)
Kodiak II
Kodiak
Bruin
Warhammer IIC
Guillotine IIC
Battle Star (Frontline, 5/8/X)
Timber Wolf
Ebon Jaguar
Stooping Hawk
Mad Dog
Karhu
Battle Star (Frontline, 5/8/5)
Summoner
Karhu
Huntsman
Huntsman
Nova
Battle Star (Frontline, 6/9/X)
Linebacker
Stormcrow
Shadow Cat III
Shadow Cat
Adder
Striker Star (Frontline, 7/11/X+)
Grendel
Ice Ferret
Viper
Hellion
Arctic Cheetah
You can massage the composition of these stars.
Mechs with MASC, like the Executioner and Shadow Cat, can edge into one speed band higher tactically (if not strategically).
I put your 3/5 standard mechs in a separate Assault Star from your 4/6 standard mechs. But you may want to mix between those stars.
I put most of your jump-capable 5/8 omnis together so you have a Battle Star for rough terrain. But you may want to spread them out to the other Battle Stars.
I put all of your 6/9 omnis together so that Battle Star can be teamed with the Striker Star in a single Binary. Or better yet, if you have the Elementals, make it a Supernova. These are the best mechs in your inventory for deploying battle armor.
After that, I grouped the best duplicates and leftovers into a Command Star. And I grouped the worst leftovers into a Solahma or Rogue Star. By necessity, these stars are not grouped by omni/non-omni and speed bands.
Command Star
Executioner
Kingfisher
Vapor Eagle
Grendel
Horned Owl
Rogue Solahma Star
Ursus II
Hunchback IIC
Dasher II
Fire Moth
Piranha
If you have three more, slow, junky Clan secondline mechs (Ursus, Urbanmech IIC, etc.) you could add them to the Ursus II and Hunchback IIC for a dedicated Solahma Star.
Similarly, if you have two more Clan speed demons (Phantom, Solitaire, etc.), you could add them to the Dasher II, Fire Moth, and Piranha for a dedicated Rogue Star.
Lastly, here’s how I would group these stars into binaries/supernovas for a coherent cluster TO&E:
Binary Command
Command Star
Executioner
Kingfisher
Vapor Eagle
Grendel
Horned Owl
Assault Star (Secondline, 3/5/X)
Supernova
Marauder IIC
Highlander IIC
Thunder Stallion
Rifleman IIC
Binary Assault
Assault Star (Frontline, 3/5/X to 4/6/X)
Deimos
Kingfisher
Executioner
Nova Cat
Loki Mk II
Assault Star (Secondline, 4/6/X)
Kodiak II
Kodiak
Bruin
Warhammer IIC
Guillotine IIC
Binary Battle
Battle Star (Frontline, 5/8/X)
Timber Wolf
Ebon Jaguar
Stooping Hawk
Mad Dog
Karhu
Battle Star (Frontline, 5/8/5)
Summoner
Karhu
Huntsman
Huntsman
Nova
Supernova Striker <— add Elementals here first, then Battle Binary
Battle Star (Frontline, 6/9/X)
Linebacker
Stormcrow
Shadow Cat III
Shadow Cat
Adder
Striker Star (Frontline, 7/11/X+)
Grendel
Ice Ferret
Viper
Hellion
Arctic Cheetah
Rogue Solahma Auxiliary
Rogue Solahma Star
Ursus II
Hunchback IIC
Dasher II
Fire Moth
Piranha
Hope this helps.