I’ve had a LR3 for about 8 years. It was $500 back then too. Still works really well. Sometimes I have to replace parts, but the maintenance is fairly simple and Whisker has YouTube videos for how to do everything. Still highly recommended. Worth every penny.
I obviously know nothing about your business but this sounds like a mistake from an outsider’s perspective. Enterprise software exists so companies can call somebody and get help when something goes wrong. Also more people are familiar with Windows and Microsoft Office so it’s much easier to onboard new employees and find IT Administrators who can support their environment and keep things running smoothly.
I think the setup you’re describing will cost more in the long run because your company will have to find people with more specialized knowledge to help maintain everything.
I love Linux and open source software but I also think they should only be used when they fit the need.