one of two ways i open bonnets that are mounted with a tyre (i'm only 5'2")
keep the bumper clear of obstacles to stand on safely and lift the bonnet from there, better without the little curved infill panel
or i just remove the spare when i need to open the bonnet, again by standing on the bumper to gain access to the bolts clamping the spare down and then roll the wheel to the front edge of the bonnet so i can maul it off safely
i'd be concerned about gas struts developing a leak, i've had tailgates on estate cars decide the struts have passed thier "sell by date" and then the tailgate has dropped on me, i think i'd be pretty iffy about getting whacked in the back of the head by a bonnet latch pin