I have 235/65/17 on my T32 which is lowered 30mm. 215/75/16 is literally only 9mm difference in diameter, so 4.5mm height gain and 4.5mm shorter arch gap. They will technically fit without rubbing, if your van is standard height or up to 30mm drop, based on my experience, but I am guessing they will also be fine with a bigger drop too.
I cannot comment on the tyre being suitable though, as that’s a rather tall sidewall, but my 235/65/17’s run great and are super comfy. You will gain comfort on the further increase sidewall, but might find the handling is a little less crisp as that sidewall flexes more.