If Pearson thought it could make money from a recording, it would already be on the market (with regularly updated editions). Such recordings (in different languages) do exist for other assessment measures, for example the MMPI, but these are standardized, non-queried items. The necessary interaction and adaptation required when administering the WAIS (and the like) is prohibitive. Therefore, the real question becomes how significant is the psychologists' impairment relative to the necessary and sufficient level of ability required to competently administer the measure?
If you know that you have significant language/articulation problems, you are best advised to seek consultation and refer the individual to another psychologist, if indicated. Per the APA Ethical Principals of Psychologists and Code of Conduct (2010):
Principle B: Fidelity and Responsibility "Psychologists consult with, refer to, or cooperate with other professionals and institutions to the extent needed to serve the best interests of those with whom they work."
2.06 Personal Problems and Conflicts (b) When psychologists become aware of personal problems that may interfere with their performing work-related duties adequately, they take appropriate measures, such as obtaining professional consultation or assistance, and determine whether they should limit, suspend, or terminate their work-related duties.
9.02 Use of Assessments (c) Psychologists use assessment methods that are appropriate to an individual's language preference and competence, unless the use of an alternative language is relevant to the assessment issues.