I was in discussions with a potential spouse and it hit a stumbling block as she asked me to consider changing how I pray my namaz and include Aliun Waliullah. Is this forbidden and is there any Hadith from our Imams a.s to illustrate this?

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We cannot add or subtract anything from the wajibaat on our own accord.
If one is a mujtahid, then they can analyse Quran and Hadith regarding this issue, and if one is a muqallid (follower) then they must follow what their mujtahid has ruled on this issue, just like everything else.