Voltage regulators do not need to be expensive.
I've got one of these:
DC 3~40V to DC 1.5~35V Voltage Step Down Transformer Module 421830 2016
It does step down the power fairly efficiently.
On the con side, it will draw a few milliamps from the source even if no load is connected and it will draw a few milliamps from the output even if there is no input;
if you use it to charge a battery or such you need to disconnect it after charging or line it up with a diode. And you need a meter to set the correct output voltage.
Even so, a few bucks get you all the voltages you need (check the max current draw for each though)
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  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
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