I am trying to make a 2024 version of my paladin. I can pick Oath of Devotion because it is free. I can pick the Xanathar’s options and Oathebreaker because they are from 2014 content I own, but I cannot pick the 2014 version of things I own if they’re in 2024 content I don’t own. I can’t use the Oath of the Ancients.
I’m not sure what your budget and what the possibilities are but maybe if you look at things like foundry or other VTTs maybe there’s something there that’ll allow you to manage characters without paying for modules left and right. (Though I think Foundry has partnered with Wizards for 5e so you might want to look somewhere else)
I don’t have any interest in VTTs. I just like digital versions/character builders. We meet in person and play with minis.