Oh that's kinda cute, Deborah nn Dora is better than Deborah nn Deb imo. Deb is just frumpy.Please rate my "Names I would use" list if you have a spare moment, feel free to rate other lists too if you want but ik there's a lot, thank you :) https://www.behindthename.com/pnl/223226/138473
Dora, full name Deborah, was a Jew, so would presumably have been familiar with a pronunciation something like d'VORa. That seems to lead more convincingly to Dora than the usual DEBora, for which Deb is pretty inevitable as a nn.