Or just accept flying a lower performance microlight! There are plenty with 200+kg total payload, they just aren't usually the ultra high performance hot-ships.
I have flown a 503 engined Easy Raider with a 198kg ZFW and 450kg MTOW; nearly impossible to get near MTOW (we did it once for performance testing - the aeroplane was full of sandbags).
The exception is probably the BanBi, which manages payload and performance.
EDMJ: It's pretty much impossible to certify a 450kg microlight in the UK with an empty weight above 268kg thanks to a rule which requires the aeroplane to be able to take 2 x 86kg + 1 hrs fuel at MTOP. I think that in Germany you use 2 x 77kg and 30mins fuel; I suspect that the last 77kg German pilot however was Hannah Reich !
G