don't be sorry cafe,always a pleasure to help you
so..for Piapro Characters Super Pack there is physical release, you can find it on various japanese retail shop (maybe also Sonicwire, didn't check yet if is available for overseas), for example Amazon JP has it, and since it is "sold and shipped by amazon", you should be able to order it without problems, amazon jp supports english and overseas cards. most items sold by amazon jp are eligible for overseas shipping, and usually you automatically pay customs taxes at the checkout (and if there is a difference once is cleared at customs, they give you back the difference as a refund). here is the url:
(i've put it in the code tag because if i write the amazon jp url as normal text, the forum gives back an empty space as preview)
Code:
https://www.amazon.co.jp/dp/B0DBL116DF
other options are using a proxy shopping (for example from-japan) to buy the Super Pack "ピアプロキャラクターズ スーパーパック" from shops like Rakuten, Yodobashi, Bic Camera, suruga-ya and mercari
and about Miku V6, probably at 99% there will be physical version, there aren't still much info about, but we know they'll talk more later this year. same for Miku NT 2, we actually don't know if for the public release (first half of 2025) they'll keep the actual box, or they'll put a sticker on it to tell about the ver.2, or they'll make new boxes and artwork for NT2, we don't know yet