Lightning Network – Registration Fee Increase

I have a Regtest environment with some Lightning nodes. To do some testing on how Lightning nodes perform with high fees, we need to increase the fees a lot.

What is the most efficient and simple way to increase commissions? I was thinking of simply installing an ordinal wallet and generating a tx worth almost 1MB while paying a high fee. Then I thought it would be easier to simply remove the data carrier limit and add a lot of random text to OP_RETURN to create a very large tx.

Does anyone know a more efficient way to do this?