Do you know of https://en.wikipedia.org/wiki/Flexitarianism? I feel that the wiki article fails to describe a variant where the choice depends mostly on cost/level of incovenience caused by not relying on animals. That is an approach that I mostly have, my threshold of inconvenience above which I ignore is pretty low, and yet I eat mostly vegan due to the power of defaults.
The reason I mention this is that I imagine a person with a similar approach to mine, but slightly better organized and with a slightly higher threshold would eat basically only vegan food[1], but their approach to abortion would be basically unaffected.
[1] I specifically mention only food, because the levels of inconvenience caused by e.g. having to find an alternative to leather hiking boots or woolen shirts are very person-dependent.