Is there any limit to the # of evade tokens I can spend per attack?

No, you're only limited by the number of them you can manage to have.

Of course there's no point in spending more than the number of <hits> or <crits> on the table that I can think of...

Evade tokens are treated the same way as evades rolled on defence dice (see page 8 of the latest FAQ) - therefore you can spend as many as you want

you may even spend more than you need to

Evade tokens are treated the same way as evades rolled on defence dice (see page 8 of the latest FAQ) - therefore you can spend as many as you want

you may even spend more than you need to

For whatever reason

Evade tokens are treated the same way as evades rolled on defence dice (see page 8 of the latest FAQ) - therefore you can spend as many as you want

you may even spend more than you need to

For whatever reason

If there's ever a Garven Dreis ability for Focii, for instance.