In Tokyo Dialect, they transform some i-adjectives so that they become
sugoi - suggee/sugee
yabai - yabee
itai - ittee
is there any in na-adjectives? Like
genkina - genkki
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Short answer is no, AFAIK.
However, if I may go beyond your restriction of "na-adjectives", things get interesting.
For example, daikon だいこん is pronounced as deekon でーこん. Daikon is not an adjective, but you see a similar pattern as sugoi / sugee.
BTW, this is not limited to Tokyo-ben. We say Okayama-ben turns "daikon taitoite" だいこんたいといて （i.e. 大根を炊いておいて） into "deekon teeteete" でーこんてーてーて. In fact, Okayama おかやま itself can be pronounced as Okyaama おきゃーま.
So when you mention "In Tokyo Dialect, they transform some i-adjectives so that they become...", well, it's not just Tokyo Dialect, and it's not just adjectives.