Test Nios II Software Build Tool (SBT) and keep NIOS II IDE 9.0 SP2

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Or... you could use the tools in a Linux environment

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You get the added benefit of >10x compile and significantly faster SOPC Builder generate times as well!

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I assume the significantly faster compile time is for compiling the NIOS software? Not for compiling the HDL design? If the HDL compiles and/or fits significantly faster in Linux, I may have to give it a try.

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There is NO Quartus II Web Edition in Linux.

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Starting with Quartus II 9.1, there is a beta web edition for Linux. I am not sure when it will be non beta. I would assume it would be fairly stable even as beta is it must be quite similar to the subscription edition for Linux. Although, I have not tried any version for Linux myself.