I've, with a mixture of inattention and brute force, stripped the threads off a really stubbornly stuck drive-side JIS square taper crank. So, I tried the heat gun approach, but presumably since this is a super cheap steel crank on a steel spindle, the thermal expansion was the same on the spindle as on the crank, so that failed.

Then I tried the loosen-the-bolt-and-ride method. Even after maybe two miles of pedaling the oddest squares I can manage, bunny hopping, riding standing on washboard gravel, etc., the crank is still hopelessly tight. Next up, I tried using a mallet and bar to hit the inside chainring at various spots from through the frame. While the crappy steel rings got slightly bent, the arm is still sock like it was welded on.

Since I do not have any electric or pneumatic cutter to simply slice the f!#@$ng arm off, I'm kinda stumped. I'm planning on replacing the 68mm English bottom bracket and I intend to deposit the crank directly in the bin, but I do not want to damage the frame.

Guidance and inspiration are needed!

SOLVED: Thanks [MENTION=371991]GravelMN[/MENTION]