That sounds like a great (and better) solution! Thank you for your attention & effort 👍🙏

Debian's wiki also speaks a lot about the advantages & dream of subkeys, but also mentions the caveat:

I've read many articles mentioning the improved key handling when different devices just have different subkeys, thus allowing a semantic connection to a primary identity (instead of different "Identities" on different devices)

Thanks for the reply :)