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Screen with warriors? Doesn't seem quite right though. Your lychguards should be protecting the warriors from the assault...
I did read an article involving Tyranid tactics where a group of genestealers was kept behind some termagants. When the enemy got close, there was enough of a gap between the gants to let the genestealers poor through.
I supoose a similar tactic would work. Conga line of warriors in front, probably with a rez-orbed lord thrown in to help them survive any shooting. They provide the lychguard cover saves, and the lychgaurd can slip between the warriors to assault once in range. If something does assault the warriors, the lychgaurd can counter assault on the next turn.
Might work out.