Well, INT does help out with magic attack obviously - especially at lower levels - but it’s not all that mandatory if you ever intend to gear the char up reasonably (say +11 or higher prac weapon 100%+), since INT offers a fixed amount of magic atk which gets smaller and smaller the higher the weapon’s dmg goes.
But anyway, if you don’t feel like trying a cryo-sorc-wl build, hmm, best I can think of is getting some thauma ranks in there for extra group utility and to make your bursts higher on Warlock. Cryo 3 Kino 1 Rune is too gimmicky for my tastes, so I’d skip it, but it’d be a very decent boss killer (psychice pressure+IW combo and pole+Theurge) and aoe burst with frost tree+ice blast+mastema whenever Rune of Ice is up, with the obvious downside of huge CDs.
If you don’t mind missing out some mastema damage (pretty much all warlock 2 has to offer right now compared to WL1), you could go Cryo 3 Ele3 WL 1 and get a new class at rank 9 instead of whatever WL3 brings to the table. Cryo Ele has a really nice playstyle of freezing and grouping targets than AoEing them to death (not to mention eletrocutate does insane damage on mobs frozen by cryo skills).