Dual Citizen Border Hopping to Extend Tourist Visa

My 90 day Namibia tourist visa expires next month but I would like to stay longer. It is too late to apply for an extension, so it would seem that my only option is to border-hop. I am in the lucky position that I have two passports - a French one and an Canadian one. The Canadian one hasn't been used at all in Africa.

I imagine the steps for obtaining a new 90 day tourist visa would be as follows:

Exit SA on my "used" French passport to get an exit stamp.
Enter Namibia on my "fresh" Canadian passport.
Stay for a few days, then leave Angola using my Canadian passport.
Enter Namibia with my Canadian passport.

Will this succeed?

tourist-visas

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Can tourist visa get extended?

If you want to extend your I-94 date or extend US visitor visa stay in the United States, you must file a request with U.S. Citizenship and Immigration Services (USCIS) on the Form I-539, Application to Extend/Change Non-immigrant Status before your authorized stay expires.

Can I renew my tourist visa in the US?

You must renew your visa at a U.S. embassy or consulate abroad. Only diplomatic visa holders and their dependents may renew them in the United States.

Can you extend a 6 month tourist visa?

If you need to extend your I-94 date or U.S. visitor visa stay in the United States, you must file an extension of stay with the U.S. Citizenship and Immigration Services (USCIS) with Form I-539, Application to Extend/Change Nonimmigrant Status, before your authorized stay expires.

How soon can I re enter the USA on tourist visa?

There is no limit on the number of times you may enter the U.S. under either ESTA of a visa. However, if reentering the U.S. using ESTA soon after staying for nearly 90 days, you can expect to be questioned in detail by the immigration officer about the purpose of your visit.

Traveling with two passports - I almost got arrested | Jure Sanguinis Italian Dual Citizenship

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: ROMAN ODINTSOV, Keira Burton, Keira Burton, Laker