White Oak Questions

[Irish Redneck]

Hello, currently I'm working on a second batch of rum. I have different ideas for each quart of this batch as with the first batch I ran not too long ago. A couple are just for quick flavoring while a few I plan on letting sit for a bit on some white oak. I reside in Kentucky so there's a wide variety of oaks around here. There's a couple of mature trees I've spotted that I was going to use as fire wood (and probably still will) but since beginning this hobby I've had other ideas for them. Here's the plan...age the undiluted product for a year (while letting the oak dry) toast & char the oak before adding to the product for another year. I have already looked through quite a bit of threads both on & off the site, I like to take multiple sources, & have came to some red flags that need to be put to rest before I continue. It seems that aging on oak seems to be just as debatable as 'dunder' is. My first big concern is toxicity.
Multiple sources tell me that oak is fine & that the tannic acid in it is, while bitter, not dangerous to humans. Likewise; I have multiple sources, some wildlife experts, that tell me that every part of the oak is indeed toxic to humans. Some sources put more of a dramatic effect than others on it. For instance, some have said it is only toxic if in large amounts, some over time it is toxic, some say it's minor. I understand most basic chemical reactions so I know the tannic acid is a big part in the 'aging' process & leaching it out before aging would be kind of a waste. I also know that oak couldn't be as terrible as some make it out to be because it's a major part in any spirit making, so my first questions are, Is there something done to raw white oak that seems to make it completely safe for human consumption in major distilleries? If so, what & how? Are there any risk to the process? If yes, what are they?
Next question & last, assuming safety of the previous questions, has anyone tried aging with multiple varieties of white oak? I love to experiment & mix things & I know each variety of oak has its own unique characteristics. I also realize this is an opinionated question so I'm just trying to get an overall idea. If anyone needs any further info please ask.