Well, there kinda can be a loophole for that. No clue if this would change anything or not but:

If you can justify making the Lockseed in your own character's unique style like the difference between Kouta's Suika Arms and Kaito's Suika Arms, then yeah! Go for it! If you wanted to use a form change lockseed as their major form (except for Suika, Kachidoki and Kiwami, they're a way OP for a base form), then yeah! Also go for it!