Is it posst to have independent controls/schedule with Amazon Freetime/Kids on Echo and Fire Tablets

I have Echo dots in 3 of the kids rooms, and two of the kiddos have a Fire Tablet HD 8 Kids. I setup their Freetime/Kids parental controls initially for their tablets to cut off at a certain time so they have a limit on screen time. Their tablets travel between my and their mom's house, so its nice to know they aren't being overused over there.

I recently setup their Echo devices under their same Kids profiles rather than default to mine. Unfortunately, the same cutoff times now apply as the tablets. Meaning at bedtime, they can't do things like use the Sleep Sounds skill, listen to music, or hear a story. (I could change the cutoff/bed time, but then they could use their tablet later.)

I'm frustrated with with Amazon's one-size-fits-all parental controls. I dislike their poorly thought out constraints on the tablets especially. (No concept of an educational app like IXL vs a game.)

I may see if there's another 3rd party option for the tablets so I could use their Amazon profiles just for the Echo devices. Or replace the tablets with android or apple at some point, but cost is a factor there.

A clunky option I've yet to try is setup a new Kids profile for the Echo(s) dialed in how I want. Downfall of that is calling/communication won't work well as it's either one generic Amazon Kid account/contact or each child has two contacts now.

Any other thoughts from parents in the same boat?

Edit: Grammar and Title should read "Is it possible..."