Hi, can you help me choose dynasties, relics and more for this list?

I have the follow 3rd edition models:
Battallion detatchment:
HQ
Lokhust Lord w/ressurection orb
135 pts
Overlord
95 pts
Troops
5 Immortals (
really pariahs)
85 pts
20 Necron Warriors
260 pts
20 Necron Warriors
260 pts
Elites
C'tan Shard of the Nightbringer
370 pts
3 Canoptek Spyders
180 pts
5 Flayed Ones
50 pts
Fast attack
5 Canoptek Scarab Swarm
75 pts
5 Canoptek Scarab Swarm
75 pts
4 Canoptek Wraiths
140 pts
Heavy Support
4 Lokhust Destroyers +1 Heavy destroyer
240 pts
Total 2000 pts
The only models I have surplus is 1 immortal and a unpainted foot lord with ressurection orb. The list was 2k points in early 2000s sans the C'tan, and is now 2k incl C'tan
Planning to play friendly easter games with experienced players. I've played a few matches in 9th, but it feels a bit overwhelming with all the extra rules
So:
Question A: Should I drop some scarabs for weapons for the lords, gloom prisms, etc?
Question B: Can you help me pimp this list in regards to:
1, Dynasty. Which one?
2, Command Protocols?
3, Warlord trait?
4, Dynastic Heirlooms/Relics? I'd like to use Command points before the match, so perhaps 2 relics?
5. Which powers for the C'tan?
6. Secondaries, are there secondary objective I should consider?
Bonus Question: I could kit bash a Cryptek from the unpainted orb-lord I have. Should I? Would it be worth it for Cryptek Arcana and synergy with spyders and wraiths?
The army.
(Needs a little glue)
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Thanks if advance if you take the time to give this some thoughts.