Hate white lined geckos. I had one named Rick James I acquired when I worked at a petstore bc another gecko bit off a couple of his toes thus unsellable. I gave him away bc he was so mean and spazy. Hid all the time as well so pointless as display animal.
Anyways.... Yeah wouldn't do that. Idk about flying but the white lined are somewhat aggressive to their own species, wouldn't turn out well if I had to guess.
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I had a flying gecko and a house gecko for some time In a 29 tall. Kinda the same dimensions as a 20ong with top extension. Id say research the needs of each and see what is possible. I traded my flying and house geckos for a 8" albino poly at a lfs. Wasn't my thing