Take a look at the mp5 sights on hk parts .net . If a few guys want them I'll order them in. You would have to remove the factory sights and tig these ones on ...
I'd be up for that - provided I could find someone to do the work.
I'm assuming the front sight would be the mp5 SD version? (http://www.hkparts.net/shop/pc/Front-Sight-Tower-For-MP5-SD-US-87p15699.htm) - Since it doesn't have the "triple tower" that wouldn't fit the lusa?
As for the rear sight, it has a little "slot" on the bottom where it fits on the mp5 - I imagine it shouldn't be an issue to just tig weld the sides?

Total franken-gun stuff...but it should work?