Just checked, and unfortuantely it appears that due to the mounting the valance doesn't actually touch the top of the blind and the clips are designed to mount it a few mm forward. Consequently I don't think Velcro would work...
Velcro does no hold it tight to unit. many blinds use velcro for valance or double sided foam tape, the latter could be used to make the vecro hold the valance away from blind head.[Use tape to pack the velcro]
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