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As Merlin said. The only barlow/powermate that doesn't work this way is the TV 2.5X Powermate. I think my extension is just over 115mm long, which gives me just shy of 3X with the 2X. You will still be able to come to focus as the SCT has plenty of room in that area. Just dropping another (without the elements) barlow in on top may give you too much however. You'll have to experiment in that area.
The Klee 2.8X should be perfect in good seeing actually, with a well collimated scope. I also recommend not skimping on barlows/powermates. I've used a few el-cheapo barlows, but I wasn't stupid enough to purchase them thankfully. Save up & shop wisely.
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