Using deck lid struts with a wing has always been problematic. Wing weights vary all over the map so a generalized strut pressure will often not work. Too little gas pressure in the strut and the lid sags. Worse, too much gas pressure and the steel roof warps! Yes- this HAS happened and is is not cheap to fix! Because of this, most U.S vendors will not sell struts that are above a certain strength. Ted Mitchell's Vader Enterprises sells a pair of strut-lift mechanisms that use coil springs and an over-center link similar to mid-'50s U.S cars hood-lift systems, rather than gas pressure struts.
Possibly the best cheap solution is stock-pressure gas struts and a strut clamp that some U.S vendors sell for a few dollars. Once open- possibly with owner assistance, the 'clamp' snaps over the extended strut-rod on either side (only one side needed), keeping the strut and deck lid from moving down until the clamp is removed. No tools involved and the clamp stores unobtrusively.
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