Interesting I’m not very familiar with the Wallace / parents lineage and wasn’t aware how closely related they are by now - is there anything in wider EU or even in US that’s not so related they might bring in?
So Wallace was born at Longleat in 2006 to Kabir x Yendi(I'm sure she had the first 4x litter). Anyhow Kabir produced 10 cubs at Longleat with the 0:2 full sisters Lunar and Yendi so Wallace has plenty of siblings, full and half.
His sisters Malaika and Jassera head up both prides at Longleat with other siblings and nieces & nephews in both prides.
Wallace's daughter Lunar(born 2009) is living at Folly Farm with her daughters. Non breeding as far as I'm aware.
Newquay zoo or Paignton now have got 1:2 who I think maybe Wallace's grandchildren via his daughter.
Dartmoor have Wallace's daughter Kimya(born 2009).
Flamingo Land only have 0:4 females but they haven't long had a new male so they won't be moving plus the youngest is 13yrs and the oldest is 22yrs.
AA haven't long had their lions return so don't see them being split up.
Colchester only have a single male.
Blair Drummond potentially are the only place with available females.
0:4, Hope,Faith,Thistle & Isla.
However Khari's mother and 2 aunties were born here at BD so I don't know if this would work genetically