Is there any way to prefer resource policies over principal policies?

[jfly]

We've got a single iam user with access to send messages to a bunch of sqs queues. If we call grantSendMessages for each of these queues, we end up hitting the inline policy size limit for that IAM user. This is because each call to grantSendMessages calls grant, which calls iam.Grant.addToPrincipalOrResource, which successfully adds the policy to the iam user, and because the user and the queue are in the same AWS account, we stop.

We've been able to work around this by carefully crafting a more compact iam policy, but I'd like to understand if there are more idiomatic ways of doing this in cdk. For example, could we instead have grant prefer to add resource policies over principal policies? Then we'd end up with a bunch of tiny policy documents scattered across our many queues (:partying_face:), rather than having them all accumulate on our iam user (:sob:). Reading the code, I'm pretty sure this isn't possible today, but is this something that's been discussed before? Or are we just going about this all wrong?