So was going to say, the most easiest way to do this split (without taking nations from any other confederations except Oceania) is to go by the sub-confederations that AFC currently have.
If we count Oceania as a new 'sub-confederation' it can effectively be split 3-3 down the middle (West, South and Central stay, with ASEAN, East and Oceania forming the new "Pacific Football Confederation").
The "Pacific Football Confederation" would have the following 31 full FIFA members:
- Australia
- Brunei
- Cambodia
- Timor-Leste
- Indonesia
- Laos
- Malaysia
- Myanmar
- Philippines
- Singapore
- Thailand
- Vietnam
- China
- Chinese Taipei
- North Korea
- Guam
- Hong Kong
- Japan
- South Korea
- Mongolia
- American Samoa
- Cook Islands
- Fiji
- New Caledonia
- New Zealand
- Papua New Guinea
- Samoa
- Solomon Islands
- Tahiti
- Tonga
- Vanuatu
New Asia would be the following 25:
- Afghanistan
- Iran
- Kyrgyzstan
- Tajikistan
- Turkmenistan
- Uzbekistan
- Bangladesh
- Bhutan
- India
- Maldives
- Nepal
- Pakistan
- Sri Lanka
- Bahrain
- Iraq
- Jordan
- Kuwait
- Lebanon
- Oman
- Palestine
- Qatar
- Saudi Arabia
- Syria
- United Arab Emirates
- Yemen
In terms of men's World Cup Qualifying, between the two at the moment (Oceania and Asia), they get 9.66 qualifying slots.