Motorized blind retrofit

[Dave Horoschak <dth930@xxxxxxxxxxx>]

Has anyone been able to retrofit existing shades or blinds into
motorized units?  I have Hunter Douglas PowerRise blinds which are
battery powered, but I'd like to retrofit them to a wired system for
more reliability and better performance.

Is it possible to purchase just the motors or the headrail assemblies so
that I can reuse my existing material?  I know that companies like BTX
and Somfy offer this sort of thing, but their cost to retrofit is about
$300/shade and they won't sell the motors separately.  I'm sure I could
do the retrofit if I could get my hands on the appropriate motors.
  - Dave