We don’t know if he’d get fewer votes than Johnson in his home state. All he has to do is perform slightly better than Johnson. 3.79%, for example, although that would presume the race is identical to 2016, which it won’t be.
I’d bet you your soul that he won’t get 2%.
Johnson ran a national campaign with a party. Monster Mash won’t come near those resources; is barely known outside his district, and is/was known as a conservative. No, he won’t be drawing even 1%.