It would be great if the request type groups were also exposed to the search filters and/or JQL. Specifically the use case here is when you want to have a singular service desk entry point but issues created from it are isolated to individual agile boards for segmented teams.

At the moment the only way to do this is to create many "duplicate" request types that map to an issue type for workflow and group for display then have the board filter against the various (sequential variations, e.g. request-name and request-name2) request type names you might need. This of course can be managed with some level of accepting duplicates on the request type and the expectation that any time those change the filter for the board will need to change.