Again I understand the reasoning behind your statement but then you were considering dropping almost $4,000 on a system based on 10 year old technology. That doesn't appear to be a very wise use of money.Okay, I'll admit that it's a viable option if money and time we're not an issue, but by using that as a basis for logic, I could go ahead and get a job at Apple, rise up the ranks to Chief something or another and wait for Timothy Crook to either die or be ousted from his position and take over as CEO and demand better Apple hardware myself to solve my problem. I'm getting to the age where retirement is a more realistic option than what you've proposed... Just sayin'...
Perhaps it might be smarter to begin your migration, you don't have to do it all at once. The Z620 I am typing this on I picked up on Ebay last year for $900. It's equipped with dual 2.9GHz octa core processors (32 threads total), 64GB of RAM, 1TB spinner, and a Quadro 600 video card. I added a 256GB M.2 AHCI drive for $150, a 512GB M.2 NVMe drive for $200. For another $250 I could bump it up to 128GB of memory (it supports up to 192GB). Throw in a Sapphire HD 7950 w/3GB of memory for $100. Total: $1,600. Oh, did I mention it supports Thunderbolt 2? Throw in another $190 for that card and you're at $1,800. With this configuration you have $2,200 remaining to buy software (some vendors will allow you to use your existing license for software which is available on both platforms).
I'm not trying to convince you to switch but rather say switching is an alternative. It won't be painless and it will cost money. But if it's done as a migration and not a wholesale replacement it can be managed. Normally I wouldn't bring this up as I love Apple solutions. The problem is that Apple isn't offering one and, assuming they do with the 2019 Mac Pro, are you willing to risk another five year delay or outright abandonment of this segment?
EDIT: Thunderbolt pricing
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