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In case for the other investments asset, they will serve as a means for backing us up to have an alternative source of income, and if things does not really works out as expected with them as well, we revert back on our emergency fund and use for any urgent need arising, so having all these in place, we may not be able to consider touching our bitcoin investment as we continue to hold until the market gives the required signal for sell.
I think you are almost talking same thing as diversifying if I am not mistaken and JJG and some others has address this issue that one should not thinking of diversifying until they have gotten to an overaccumulation stage because when you say other investment asset you are indirectly talking of other investment aside Bitcoin investment which can still sometimes distract one from there main investment ( Bitcoin investment).
I don't think it is even advisable to use other investment asset as a means of back up. Someone who is ready to invest in Bitcoin will always ensure to have a good discretionary, back and emergency funds the back and emergency funds are used for unforseen circumstances that may arise and so using other investment asset as a back up funds is not really a good strategy per say.