MM when i talked to Avanza customerservice they told me that it didnt matter if you use a kapitalförsäkring or a aktiedepå, you would NOT be able to sell/buy shares in otcqx.
If you have your shares in aktiedepå they would become "onoterade aktier" and you would have to sell them without the help of Avanza on some private site.
im about to move my shares from my aktiedepå in Avanza to my aktiedepå in Nordnet.
There you can still trade your share after the delisting, but not the regular way, you have to go through a broker on Nordnet.
This is the answer i got, but please, do your own research, i cant guarantee anything.