Need help accessing BTC wallet - any programs that can work with json keystore data similar to mycrypto?

I have backups of 3 wallets, a BTC, ETH, and LTC wallet. I remember using Bitcoin Core a couple of years ago as well as Litecoin core. I thought there was some official main ETH wallet but I couldn't find any program that looked the same. The LTC wallet had a .dat file which I dropped into my Litecoin Core files and it just magically worked. I am not a fan that this process didn't have a password, but I guess the security was in keeping that file safe. The ETH wallet came as a bunch of json data. MyCrypto had no problem importing this data as a Keystore file combined with the password..

For some reason my BTC wallet appears to be json data + a password as well. I thought I exported this with bitcoin core, but I can't find any way to import it, nor can I confirm that I actually exported it this way. Ultimately I think just need to unlock my private key from the encrypted data in that JSON file. The JSON file looks like this (data omitted, of course):

{"iv":"data..", "v":1, "iter":10000, "ks":128, "ts":64, "mode":"ccm", "adata":"", "cipher":"aes", "salt":"data..", "ct":"data..."}

So it appears to be aes-128-ccm encrypted, and I tried to use the password (I'm 100% sure the password is correct and this is the original file) to manually decrypt the contents using this: http://bitwiseshiftleft.github.io/sjcl/demo/ But it doesn't seem to be working. Not sure if it's something on my end or if it's related to something like this: https://github.com/bitwiseshiftleft/sjcl/issues/53

Any ideas of what to try now? Or any BTC programs that can deal with a keystore file similar to mycrypto?

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