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One of my Amiga 500 is a rev 5, and it came with an OCS Agnus, which I assume yours does as well. The cheapest way for you would be to acquire an ECS Agnus PAL or NTSC and swap it out. You can then use your ACA500plus software menu to enable 1MB chipmem since you have that 512KB trapdoor expansion.
You can acquire that chip quite easily on ebay, but you will need a chip puller to swap it out, it's a bit finicky and requires some skills and manhandling.
The ECS Agnus is always both PAL and NTSC - it's software- and hardware-switchable. The Agnus type you're looking for is 8372A. Vesalia sells it for 11,90 EUR including tax.
Still, this will only give a max. of 1024kb of chip ram - a tiny bit less than the 1088kb that the original poster asked for.
The last reply was more than 365 days ago, this thread is most likely obsolete. It is recommended to create a new thread instead.
