you should have done the backup and dump of otp/seeprom the day you hacked your console, but like lot of people you probably thought a good idea to skip this important step. at least you have a NAND dump.
I'm not sure about the cert files though. maybe they could be found on Jnustool? no idea, sorry. but first you need your own OTP.bin and seeprom.bin or else you can't do anything with your dump files.
I don't know if this is true, but I remember reading something about cbhc and the slc. if you don't have an otp.bin but an slc dump, you can use that (as long as it's not a cbhc brick). if it is a cbhc brick, you need the otp.bin to fix it. best to have all backups though.
In Cemus "mlc01" -directory (the folder structure remains, also for example "Mlc01\sys\title\0005001b\10054000\content\ccerts\ WIIU_ACCOUNT_1_CERT.der". Since v1.11.1 the whole folder must be dumped!
Account data: storage_mlc\usr\save\system\act\800000**\account.dat
Replace the stars with a number for the respective user account
The account must be linked to a Nintendo Network ID!
Copy the accountdata to: mlc01\usr\save\system\act\80000001\