something like a BoMar rear sight with the dovetail milled off and cut as low in the upper frame would be a nice change but the front sight would still need dealing with
a front sight off a Ruger 2245 might be a starting point
the thing with odd projects that have not been done or publisted is a good imagination and because sometimes we don't have the money to have someone do the work and we need to reuse off the shelf items, it is my MO because I have good ideas but lack a mill and lathe to make the project simple
an idea that is had and tested was using billow blocks as a lathe and or cut off system, powered with a cordless drill but then again you have to make up a tool without the right tool
we can only try and do our best
mike
I have some of these base, I bought them for no real reason, I thought they could be used down the road
so the HW45 rear sight slot is 9mm + or - and these bases are 12.76mm and 7.07mm in thickness and designed for a 1 inch tube or there about
but the base could be made to be 9mm to fit in the empty rear sight area and cut as needed for a Williams sight and that would be target enough
you can cut these down on router table use a 1/8 mill bit or a table saw because they are aluminum
so with that done you are down to the front sight
these bases are cheap and on sale
https://www.brownells.com/optics-mounting/rings-mounts-amp-bases/rifle-bases/no-100-4-dovetail-base-sku080030104-385-1746.aspx?sku=080-030-104 it's a good starting point, without any mods to the factory pistol just to the base it just needs some more R&D
what if the front sight was extended out over the front of the pistol to lengthen the sight radius and to leave the factory front sight in place, still work on the details
again just ideas but I'm a dog with a bone sometimes