My quoted version of the RoS clause was deliberately very simplistic. The client can refuse to accept your substitute, obviously. However they should only refuse on the grounds of technical ability and fitness for purpose - you can't really expect to be allowed to sub a team leader with someone with no team leading experience, for example - but not for other reasons. Putting that in to a contract is not a simple task.
For example, an extract ftom the PCG standard contract contains, in part
Quote:
...but nevertheless [the service provider] reserves the right to substitute (and, if so required by the Client on reasonable grounds, will substitute) other personnel of equivalent expertise.
The Service Provider acknowledges that the Client has the right, under its contract with the Agency, to refuse to accept Services from any personnel on reasonable grounds related to security, qualifications or expertise....
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In other words, if the sub is fully qualified and capable of doing the role, the client will need a
very good reason not to accept them.