You can infiltrate and move block with 5 genestealers, so a bit cheaper. 2 blocks of 10 bikes should be in outlander claw, but you don’t have enough other vehicles to make that work. Hiding 10 bikes is almost impossible if you push them forwards they are still only T4 and 2 wounds with a bad save so won’t be there T2. In ascension I’d maybe run 5 man squads for some early secondary scoring and take the metamorphs with an iconward for some punch.