But those were Polish citizens considered by the Nazis as "Germans", they didn't see them as "Poles", and they were quite often forced to sign the Volksliste
First, nobody was forced to subscribe to the Volksliste. As it made no sense for the German Army to get unwilling, German-hating Slavs on the dangerous weapons.
To the contrary every possible applicant had to bring some proof of traces of his german ancestry.
That "being forced" thingy was a convenient afterwar myth of polish germans wanting to survive the revenge of the victors.
Starting with the Volksliste and ending with the defeat...it was better to say "they had been forced and had been fully patriotic Poles" than to tell the truth!
Second...no, there hadn't been a polish Waffen-SS unit!
All international units fighted together officially to save and rescue their countries from Bolshevism and Communism or in the Baltic and Ukrainian case for the independence of their countries (officially).
For Poles nothing of that kind was planned...Poland would had been fully incorporated into the Reich, so those Poles eligible got incorporated into the german forces instead of building a polish unit!