Simulating underpriced pending transactions with Anvil

[norswap]

As the title implies, I'm trying to simulate transactions that are stuck in the mempool with an insufficient basefee.

The issue is that:

• Anvil rejects transactions with a too-low basefee (which is probably standard node behaviour)
• I tried using setNextBlockBaseFeePerGas to bump the fee immediately after sending transactions, however that causes the transactions to be purged from the mempool (but not included IIRC) — this was with interval mining enabled so that the transactions wouldn't get included

Is there another way to achieve this?