"changeable by" is correct and usable in written English.
You can use it to refer to something that can be altered or modified. For example: The size of our team is changeable by our management, depending on our needs.
Biba Schutz's "Orbs" dangles multiple round works of different shapes, changeable by adding or subtracting beads.
As this 45 bases DNA is changeable by dehybridization, successive different DNA targets can be detected.
Shape and physical properties of dielectric elastomers are changeable by voltage.
For Diamond, the factors are changeable by individual and collective acts of will.
To the extent that the distribution of looks is changeable by an increasingly affluent and beauty-obsessed public, how those possible changes would affect the returns to beauty is also important.
First, all five constructs are malleable in educational settings; that is, they have been shown to be changeable by an instructor in the learning environment (e.g., Reeve, Jang, Carrell, Jeon, & Barch, 2004; Turner et al. 2014; Wang & Eccles, 2013).
We reflect that uncertainty by specifying that MEMBRANE UNITS are changeable, and by not specifying a mapping between a MEMBRANE UNIT and a precise amount of membrane area.
Their soundtrack is sometimes the wind, sometimes a terrifically changeable score by A V Linton, with additional music by Julianna Barwick.
This is a changeable voice, by turns tender, dry, fierce and scathing.
3 We see no meaningful distinction between such absolute provisions on debt, changeable only by constitutional amendment, and provisions that legislative decisions on the same issues require more than a majority vote in the legislature.
The supertrendiest Paris clubs of the moment are not really clubs at all, but one-night-only parties staged in changeable locations by celebrity D.J.'s for their 200 closest friends.
