You could install stronger rubber bands.
Seriously, the S-211 was never intended as a combat aircraft. It is a trainer designed to introduce beginning pilots to the world of jet flight, no more. In America we say that one can not make a silk purse out of a pig's ear.
Save your money until the Philippines, hopefully, straightens out its fouled up, inept and incompetent political system. Then start over and do things right from the beginning.
Seriously, I am married to a Filipina and have gobs of in-laws there. Their opinion is the same as mine. Until the Philippines reorders its political, social, and economic system it will always be mired in the international backwaters. In 1950 the Philippines had the second largest economy in east asia, now it is tied for 15th with Vietnam a country that endured 30 years of devastating warfare. In the Philippines the rule is that the rich get richer and the poor become more numerous. Think why it is that tiny little Singapore is a major economic entity so far surpassing the Philippines.
One can not base any form of credible defense system on a failed economic and political system. Trying to do so is throwing good money after bad. The Philippines may as well continue doing what it has always done by depending on its friends and allies to bail it out when the going gets tough.