Attaching the mast heel to the keel step

[Weyalan]

I have a keel stepped mast. The heel of the mast sits in a tabernacle box, but is not actually attached to it in any way. These days it is recommended that the heel of the mast be securely attached to the keel step (and, indeed, it is a requirement if competing in ISAF offshore racing at CAT 3 or above).

So, given that the tabernackle box is rectabgular and only has an upstanding lip of about 1", I am thinking that I could get a couple of substantial tangs welded onto the side of the box, and drill through the heel of the mast and fit a substantial pin or bolt: Do you think that is a good idea, or have you any suggestions of a better plan?