MDE plan 2 is no assurance of security. There was an incident where Microsoft, in their infinite wisdom, pushed out definitions that caused the removal of many valid app shortcuts freaking users out that all of their apps were deleted. This is not an isolated incident. MDE makes sweeping changes to millions of machines that Microsoft appears to barely test at all.
I pay $70 annually for Microsoft 365 (read: Microsoft Office), that's ~19 cents per day. That's practically nothing.
Commercial licenses are more expensive, but businesses will have bigger budgets to match.
I guess what I'm trying to say is: At some point you'll come off better just admitting you're a cheapskate who doesn't want to pay for software.