If you can get parts for it
Another idea is to add a storm rider barrel band and mount a random sight like this to it.https://www.pyramydair.com/product/diana-stormrider-barrel-band?a=8553https://www.thingiverse.com/thing:2097795
Yes by lowering the front sight it forces you to raise the muzzle end of the gun to align it with the rear sight.
I raised the front sight on a Crosman 130 pump( it's a beater) by Super gluing a lite pipe (Fiber Optic) to the top of the sight. Super glue can be removed(to change it back) with nail polish remover .
QuoteIf you can get parts for itHaha..... I wish! I haven't found Diana parts available anywhere.