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You can not use a lightweight flywheel without having the ECU tuned for it. You have to remove the ECU and send it to Hondata; and they'll re-flash it for you. The instructions are on their website.
If the bushing is installed where it slides past the machined area on the input shaft, the clutch won't disengage.
If you can't find a bearing installer in the right size you can make one. Find a deep-well socket that just fits inside the bearing. Then find another socket that just fits over the first socket. Nest them inside each other and use that to keep the bearing straight while you tap it in.If you just tap it in without a bearing installer, get a couple of extra bearings in case you mess it up.If you don't get the splines in the steering column lined up exactly, you will get a bunch of check engine lights. Not a big deal, you'll just have to re-align it.