No this is not an option
The 4350 is a biamp only design, the brain child of Walter Dick and developed by Pat Everidge. Ed May designed the new 2230 woofer, the first to use acquaplas coating and the 2202 mid driver.
Attempting to use a passive crossover to the dual woofers would technically compromise and significantly impair the performance of this design.
You can of course try it as a diy project but don't refer to it as a Jbl 4350 as this will only confuse other readers when they do google search of the JBL 4350