Random thoughts - semi+lever/trombone/straight pull

A small, lightweight rifle/carbine.

Should accept all of:
Five-seveN magazines
Converted M1 carbine magazines
Longer (front to back) custom magazines
Alternative magazine arrangement:
P90/PS90 magazines, mounted on the side, rather than the top.
Dual side-mount magazines (left and right) with the ability to quickly select which to feed from.

Must be easy to SBR.

Must be easy to take down.

Should be capable of semi-auto.
Should have lever-action or trombone-action or straight-pull as FTF/FTE recovery and alternative manual cycling.

Safety selector should be "safe", "manual", "semi"
Manual mode should lock the bolt until positive action is taken to cycle the bolt by gross action (no fine motor skills required.)

Ideally, would duplicate reciever dimensions of an existing/common firearm.
Should have folding stock as option.