DP on skate rollerskis with classic poles?

I use Marwe 610's for skate rollerskiing, and really like the way they
handle the rough roads around here. I have some classic roller skis with a
metal frame that get bounced around like crazy. Hence, I want to do classic
DP training on my skate rollerskis. In other words, use my classic poles
for DP-only workouts on the skate skis. As I see it, for DP training, the
ski doesn't really matter at all (except for a very slight difference in
height with my particular skis). Obviously the boots are different, but for
doing DP, how big a deal is that? Please let me know if I'm doing something
that will ruin my technique, etc. Seems like for building fitness this
should work fine. Thanks for any thoughts!

David