Two suggestions...
1) Wait 5 years until cameras with live-view eg Canon 40d or 450d come down in price and then get one and pull the mirror out and stick the lens in.
2) While you're waiting for (1), stick an eyepiece at the end and use it as a superfast, low-mag refractor. Don't worry about the coma or anything like that, just have fun with it. I did this with a lens - drilled a hole through a rear lens cap and glued on a 12 mm eyepiece. Works great!
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