"Is this technically possible to go direct from pink to NAS? Never saw that"
It is.
For example GALT (FKA PRWP) did this, albeit with the aid of a reverse split (please do not interpret this as an endorsement of GALT, which I still view with the utmost of suspicion).
"Galectin also announced that, effective as of March 23, 2012, its Common Stock will begin trading on The NASDAQ Capital Market under the symbol “GALT” and will cease trading on the OTC Bulletin Board. Furthermore, in connection with its listing on The NASDAQ Capital Market, Galectin has effected a 1-for-6 reverse stock split of its Common Stock, which is effective for trading purposes as of March 23, 2012."
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