Based on the Heavy Scyk mini swarms that many of us have either seen or used (to varying degrees of success) I personally think the Scyk just needs one simple upgrade card ... based loosely on the B-wing/E2 unique modification upgrade card and the Comm Relay Tech Upgrade:
Scyk/D (M3-A Scyk Only. Modification.)
"During the End Phase, do not remove unused evade tokens from this ship. You may have more than 1 evade token at a time."
Cost: 0
This retains the current cost structure of Scyk and leaves the ship just as squishy if hits get through, but it makes the Scyk that much harder to hit (assuming that the player stockpiles evades whenever possible) ... and it fits with the idea of keeping the Scyk unique rather than just turning it into a boring Scum A-Wing or a Scum TIE/FO as some people suggest.
* I drop the mic and walk out of the room.
I really like this suggestion. It is original, but synergizes well with the existing cannon titel, as the Scyk is envisioned as a low-cost weapons-platform. It is still a glass-cannon, but this upgrade just lets you extend the durability, such that you have a chance of getting your secondary weapon investment back. Perhaps it should be capped to a maximum of 5(?) evade tokens, just to prevent you from completely avoiding battle for the first 30mins and then be practically immortal (not sure if this will happen though, but I have run a Moldycrow-HWK which at some point ended up with 9 focus tokens...). The only problem is that "as-is" this modification, competes with guidance chip, so would not help the torpedo/missile titles.
So I will allow to paraphrase your suggestion to:
Scyk/D (M3-A Scyk Only. Modification.)
"During the End Phase, do not remove unused evade tokens from this ship. You cannot have more than 5 evade tokens at any time. Once per round, you may spend 2 evade tokens to change 1 blank or 1 eye result to a hit when attacking with a secondary weapon."
Cost: 0