Chosen Solution
Is it possible to replace the logic board in my mid 2010 MBP with a later model? If so, what would be compatible. While browsing the parts section I see that up to mid 2012 the main hardware and ports (number and type) appear to be identical. I ask this because 1) if it is possible, it’s cheaper than a new MBP equivalent, 2) I like the fact that this model has a built in SD card reader and Superdrive and 3) I can’t upgrade to Mojave. Thanks!
Actually, you can upgrade to Mojave using Dosdude1’s Mojave Patch Tool. It’s not that hard either. http://dosdude1.com/mojave/ Update (11/06/2018) How to install macOS Mojave on Unsupported Macs
I think you’re better off just picking up a used 2012 model Vs spending all of the effort to make this work. As for changing things about you’ll also need a new display as Apple changed the LVDS connection between these modes enough that you need that too.