Take a look at the following code section. I think this would prohibit the use of an MCP on the line side of a VFD.
I don't recall MCPs being limited to use in a listed starter assembly.
430.52(C)(3) Instantaneous Trip Circuit Breaker An instantaneous trip circuit breaker shall be used only if adjustable and if part of a listed combination motor controller having coordinated motor overload and short-circuit and ground-fault protection in each conductor, and the setting is adjusted to no more than the value specified in Table 430.52.
The code only applies to T&M work....it does not apply to contract work.