Just thinking through the numbers...
efP Latvia from what I can tell currently has around 1,000 troops deployed. I'm not sure if that includes the fairly recently added 15-tank armoured squadron or not. A doctrinal 19-tank armoured squadron is 123 personnel so I'm guessing that would mean somewhere between 107 and 123 personnel there.
The flyover Light Battalion would add 593 personnel (Generation Strength. Establishment is 833) plus however many in the Brigade HQ.
So, 1,000 (eFP Latvia) + 123 (Tank Sqn) + 593 (Light Battalion) = 1716 which would leave around 484 for the Brigade HQ and any other additional forces we add to the deployment. If you calculate the Light Battalion as its full Establishment strength of 833 then you're only looking at 244 personnel left for the Brigade HQ and additional elements.