The Varngaurd uses a Howa 1500 action. It's not quite as mainstreamed as the M700, but there are items. Plus, barrel blanks aren't pre-fit. You pick your maker, contour, bore/cartridge. Then your smith sets it up for you.
Another option is to sell the Varngaurd, and build from scratch. There are a few sources for Rem 700 actions to start.
There are way more experienced builders on here, but I'm researching and learning for my upcoming build.