I wouldn't bother to unmount them from the velcro. It may end up be unnecessary work.
If someone has the HALOS system, they will use them as is. If not, they will be buying them to unmount and unless they are going to buy all of them, probably wouldn't be daunted at taking the velcro off one or two sets.
I would mention in your ad that the velcro can be taken off (and how to do it if it is different to unmounting from blocks). If I didn't get any bites with velcro on, I'd consider taking it off then.
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