Haha, then you're in the same trap as me. Theoretically we can field sentinels, lots of sentinels, armored to hunt enemy's tanks and scout for bonus. They have regiment keyword so you can gives them orders without tank commander or Leontus + enginseers to give them invul and heal. Some FOB field guns for indirect/ heavy lascannons(but they need
los and quiet fragile) and scions with plasmas/meltas to harass backfield. I like
HWT but they also very squishy. And you absolutely want bullgrins they are good now. At least it's my current list

But it's all theory and how it's gonna play in your local
lgs/tournaments is a good question.
Also there is infantry
IG list on dakka without tanks and with report so you can check and do your own conclusion
As for kasrkins your Aquilons have gravechutes, for me it's hard to misjudge who is who, and with small paintjob difference(don't know your paint scheme but something like white line on pauldrons for Aquilons gonna fix problem) you can identify them easy.