Is this limitation on “Change Appearance” fair?


For context :

In a new campaign, the DM accepted I’d play a changeling, but wants to limit its "Change Appearance" ability. His idea was to allow only one change a day, during a long rest.
The reason he gave is that he didn’t want this ability to be "abused", as he played a changeling in the past and did abuse it by changing his character’s appearance "as often as he could". Also, since my character has the Charlatan background, he has planned to have her run into former marks randomly, and I think he doesn’t want it to be too easy to escape.

We are going to talk about it in a few day and I’d like to propose another way to restrict "Change Appearance".


"New" Change Appearance

You can change your appearance and your voice. You determine the specifics of the changes, including your coloration, hair length, and sex. You can also adjust your height and weight, but not so much that your size changes. You can make yourself appear as a member of another race, though none of your game statistics change.

Changing your appearance in this way takes 15 minutes. Your skin and organs take a half-melted consistency and start bubbling and reshaping themselves. Your bones change their shape and size. During that time, you are paralysed, blind, and deaf.

Because of involuntary spasms and various flesh noises, the target number for any perception check that could reveal your position is the same as if you were casting a spell with somatic and verbal components.


Questions :

Would these changes prevent the abuse of the "Change Appearance" ability ?

Is the description clear enough ? Not too long ?

Does it feel like it could be integrated smoothly into a campaign?

It’s not too restrictive ?

Related : previous question on the same subject.