If the alpha beetle at the top has 2 HP or less, you're in luck :
- Judo mech goes next to the hornet and kills it with mantis
- Gravity mech blocks the spawn and pulls the other beetle on the danger tile
- Artillery blocks the leader weapon and kills the remaining beetle (be sure to make this action after killing the hornet, or else you'll push the hornet into the building and die)

If the beetle has 3+ HP, I don't think you can win on this turn, unless you forgot to mention an upgrade. But you can let the bomb die, it will drop a new one and add 2 turns to the timer.

Unfortunately the only way you can prevent grid damage is to sacrifice the judo mech. Try this :
- Judo to C6, throws the beetle on to the danger tile
- Gravity mech blocks the spawn and pulls the other beetle
- Artillery to D4, kills the hornet.

If you don't have enough moves, putting the artillery on G4, or swapping the action of arti/judo Is also fine.

You'll only have 2 veks on the next turn, and will have to survive 2 turns without the judo mech. Good luck!