Could add Haste Samba no?
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Iirc, there has been testing done with Sword Strap and it doesn't add to Haste. It's a 3% reduction to the base delay of your 2H weapon, like Dual Wield reduces the delay of your 1H weapon. Haste reduces that further.
And yeah, even /DNC Haste Samba caps 2H delay.
Somewhere in the "pleasantly searchable" bowels of BG, pretty much at the time of release. If I was a betting man, my money would be that Kirschy at least assisted with the test in some way, if she didn't do it herself. Good luck finding it, but that's how it works.
If you want to test it yourself, I'd recommend using Drain Samba II as an indicator of your total delay. Put yourself on a break point so 3% Haste would reduce your max HP Drained, but -3% Delay would not. Do a control with the delay in question, put on the Grip, see what happens! I guess I should put the disclaimer that I'm somewhat Dancer-centric, but this seems like the easiest way to me.
sword strap affect TP/hit, no need to test further