There’s at least one obvious off-piste tour which I guess people do on downhill skis.
As David says, there’s lots of great tours in the general area with an major-uphill-ski componenent—including some starting from the L2A - La Grave lifts (Col de la Lauze)—including a highly-sought multi-day tour ("Glaciers of the Meije")
But doing it in March is a bit early to bet on favorable conditions, so if you’re still at the level of not owning your own equipment, really makes more sense (as David suggests) to hire a guide to lead in managing the (serious) avalanche risks and (serious) mountaineering dangers, as well as arranging the equipment, arranging the transport back to L2A.
I remember we did a less-serious multi-day tour there in early April found the area pretty intimidating, decided it was a mistake to have invited to join us a non-advanced-experience ski tourer, and decided that it’s really a better bet for that area to wait for late April - early May.
Ken