For a commission I understand wanting to white out a name - it almost becomes a consideration for me when I am buying the piece. If you want to display, perhaps some creative framing/mat options? Use archival tape on tape something over? That will definitely be safer than whiteout and the same level of obstructiveness.
All the art I bought for the first couple years fit into the 13x19 itoya nicely, and I had one 13x21 piece that was just floating, driving me crazy - I decided to shave it. Relatively nominal value, crisp board in good condition. The very next day after I cut it I received 2 pages in the mail that were both too big for the 13x19. So then I ordered a 17 x 22. I kid you not - THE DAY that portfolio arrived I received a Liam Sharp page that was 18x22... now I have a 18x24 portfolio with one damn piece in it... I guess I’d rather just not shave/cut.
I’ve got some older pieces with stats and word panels with the glue starting to dry out. I could easily fix it myself with archival adhesive, and probably will.
At the end of the day, it’s your artwork. Untampered artwork, with very few exceptions, always be more valuable than artwork that has been changed in any way whatsoever.
My 2 cents