@Mcveigh Daniel Welcome to Microsoft Q&A Platform.
With my current understanding of your scenario, the possible option I can think of is to directly take the link of the Application Dashboard and have it added to a markdown tile on a custom dashboard you are creating.
Please feel free to circle back if you have any further queries on this.
Also, if the above doesn't fit your requirement. Please feel free to use our feedback channel for Application Insights and create a feedback item, which would help open community to upvote & comment on. This allows our product team to effectively prioritize your request against there existing feature backlog and also gives us insight into the potential impact of implementing the suggested feature. Thank you
Hope the information helps.