When you want to have more time to prepare your marines for attack, you can use this variant of mine. It's simple:
Add one card from unused location cards (faced green side up) in the middle of formation (named for instance "void corridor"). Just like this in one player game:
When playing 'move and activate', CORRIDOR card change position like normal space marine (with adjacent SM).
Maybe you can change VOID_CORRIDOR with your yellow SM with 'move and activate' (REORGANIZE). (This was not tested yet).
Genestealers do not attacks on VOID_CORRIDOR card, because they have no target there.
I've tested this variant and it seems that is just a little bit easier (I lost in 4th location anyway :)), but brings more time before attacks or supply your space marines wit support tokens.
Please let me know if you tested it, or have something to add. Thanks.