Few questions:
1. Does the the older versions of the wallet accept the 12 word seed? IF so, do you know which verson?
2. Is the password necessary to restore from a seed?
Maybe these 12 words are your wallet password? If you still have a copy of your original wallet files you could try that?
12 words using BIP39, not that Bitcoin's BIP39 would apply here, would generate 512 bits/64 bytes of data but the Qora client generates 256 bit/32 byte seeds.
If you want to try converting your 12 words to base58 (via hexadecimal) you could use:
Online BIP39 mnemonic converter
then
Online hex to base58 converter
As far as I can tell, neither of the above tool make network requests to process the data, i.e. they are client-side javascript tools. You may wish to make your own assessment of this and other security concerns of pasting in what is potentially your wallet seed.