At this point, if I were to just save the wallet dat. file and completely uninstall and reinstall bitcoincore, is there any possibility that I will run into any problems with creating my wallet from the seed/passphrase?
That won't work.
Firstly, the problem is with your wallet.dat file, not with your installation of Bitcoin Core, so reisntalling isn't going to change anything. None of Bitcoin Core's data is removed when it is uninstalled, only the exectables are.
Secondly, Bitcoin Core does not use a seed or passphrase which can restore your wallet from scratch. You must have a backup of your wallet file.