If there is asbestos in all that, I would hire a remediation company to remove, and yeah you are going to lose the wood floors.

The only way I can think to keep them is by planing them down to remove the outside.

You are talking extreme labor and time as well as obscene risk to your health.

There is no way you will be able to do this properly with the floor laid in place. You'd have to pull up each plank and plane. You'd have to anyways and refinish the floors for them to not look like complete shit.