Actually, this trick works for pretty much any type of boot you ... sells rain-boot inserts for $30-50 (which I've used before and loved), and of course, there's always a thick pair of socks ...

Whether you need sports enthusiast trainer insoles, outdoor adventurer thick insoles, or someone who stands for long hours at work, clouds insoles can solve many of your challenges. UNIVERSAL SIZE ...

there are thick insoles -- examples include woolen/sheepskin from Overland and others -- that may be more than your foot in a correct-sized shoe can accommodate. Therefore, your idea could work if ...