Well, a bit of a search indicates that Marton Mills, the premier weaver of Poly-Viscose fabric, does not make a Henderson tartan in PV. So, that leaves you with perhaps finding something in an Acrylic, Poly-Cotton, or a kilt made in an Asian/Middle Eastern PV, Poly-Acetate ? fabric. Or, go with wool.

There are some member here who also have ebay businesses, MyClanTartan for one, who sell lightweight wool tartan on Ebay at a reasonable price which you could then have made into a nice kilt.

There may be some other options as well, but it appears you may have to change plans a bit to get what you want.

Best of luck!