So, I've commented elsewhere that I think the Tamils should be in the 600 CE scenario. Basic historical evidence for this is that the Golden Age of the Chola Empire, the most powerful civilization in Tamil history, was approximately 850-1200 CE. Additionally, their in-game leader, Rajendra Chola I, ruled in the 11th century.
Now, unlike India (whose inclusion in the 600 CE scenario at the start I've also made some argument for), no part of the Tamil UHV is expired in 600 CE. Instead, their three UHV conditions are triggered in 800, 1000 and 1200 CE.
The 800 CE UHV condition would almost certainly be impossible to meet in the 600 CE scenario, and I'm not sure about the other two. However, the 800 CE condition is historically problematic anyway, as the Tamils were weak and disunited in 800 CE, so pushing it later would not be a problem from a historical perspective. I would suggest 1000 CE. The second UHV should also be pushed later, as the Cholas did not conquer Sumatra until around 1030 CE, so I would put that UHV in 1050 CE. I would also add Sri Lanka to the territories needed for the conquest UHV (partially conquered by the Cholas in 925 CE and completely in 1018 CE), and possibly also somewhere else in SE Asia (Pagan is a possibility, though the Cholas did not control the inland city of Pagan but only the port of Pegu) The final UHV is fine, though all will need to be tested for feasibility on the 600 CE scenario and possibly tweaked.
So, basically:
Spawn date: Still 300 BCE, but included at the start of the 600 CE scenario
Spawn location: Tanjapuri (Thanjavur in Telugu, name should probably be changed) in the 600 CE start, Madurai in the 3000 BCE start (the center of Tamil learning and culture in the otherwise-disunited Sangam period, when even Thanjavur's existence is not attested)
Anuradhapura should spawn as an independent city in Sri Lanka in 100 CE on the 3000 BCE start or at the beginning on the 600 CE start, becomes Colombo on conquest by any Europeans.
UHVs:
1. 3000 gold and 2000 culture in 1000 CE (tweak for being too easy/too hard on 600 CE)
2. Control the Deccan, Sri Lanka and Sri Vijaya by 1050 CE (Sri Lanka is an added challenge due to the need for amphibious assault on indy Anuradhapura)
3. Acquire 4000 gold by trade by 1200 CE (again, tweak for being too hard on 600 CE)
UP, UB and UU are all reasonable and stay unchanged.
Now, unlike India (whose inclusion in the 600 CE scenario at the start I've also made some argument for), no part of the Tamil UHV is expired in 600 CE. Instead, their three UHV conditions are triggered in 800, 1000 and 1200 CE.
The 800 CE UHV condition would almost certainly be impossible to meet in the 600 CE scenario, and I'm not sure about the other two. However, the 800 CE condition is historically problematic anyway, as the Tamils were weak and disunited in 800 CE, so pushing it later would not be a problem from a historical perspective. I would suggest 1000 CE. The second UHV should also be pushed later, as the Cholas did not conquer Sumatra until around 1030 CE, so I would put that UHV in 1050 CE. I would also add Sri Lanka to the territories needed for the conquest UHV (partially conquered by the Cholas in 925 CE and completely in 1018 CE), and possibly also somewhere else in SE Asia (Pagan is a possibility, though the Cholas did not control the inland city of Pagan but only the port of Pegu) The final UHV is fine, though all will need to be tested for feasibility on the 600 CE scenario and possibly tweaked.
So, basically:
Spawn date: Still 300 BCE, but included at the start of the 600 CE scenario
Spawn location: Tanjapuri (Thanjavur in Telugu, name should probably be changed) in the 600 CE start, Madurai in the 3000 BCE start (the center of Tamil learning and culture in the otherwise-disunited Sangam period, when even Thanjavur's existence is not attested)
Anuradhapura should spawn as an independent city in Sri Lanka in 100 CE on the 3000 BCE start or at the beginning on the 600 CE start, becomes Colombo on conquest by any Europeans.
UHVs:
1. 3000 gold and 2000 culture in 1000 CE (tweak for being too easy/too hard on 600 CE)
2. Control the Deccan, Sri Lanka and Sri Vijaya by 1050 CE (Sri Lanka is an added challenge due to the need for amphibious assault on indy Anuradhapura)
3. Acquire 4000 gold by trade by 1200 CE (again, tweak for being too hard on 600 CE)
UP, UB and UU are all reasonable and stay unchanged.