Just bend the thing, what have you lost if you kill it? £10 and a synth that really isn't that good in the big scheme of things.
This is kind of like my VL1 arguement. You do some mods on that and what have you got? You've got a crappy little keyboard that makes some noises that are impressive in the context of a VL1, but are a bit crap in the real world.
If you just add the filter mods to an HT700 then you'll have something thats impressive up against what you could produce with a normal HT700, but when you consider that in the big scheme of things what you can actually do with a normal HT700 isn't that impressive in the first place, you might as well bend it to the limit of what it can do.
And when you've bent it let me know what you can do as i appear to have two of them.