The trade of A&P hours for CFI hours is a good one. The problem is the airplane. If you can find a freelance CFI and maintain his aircraft you will have a good relationship as with you fllying his plane he will know that it is well maintained. Lacking that, use your A&P to find a cheep fixer-up-er and put it into service. You will likely find it useful for traveling to the location of aircraft needing your attention so it will be a good investment and once it is working good you will find this may be a good income potential to buy and sell aircraft occationally. There are several models of aircraft that are out of favor with the general market, Beech Sundowner for example that are good aircraft and can be purchased at a reasonable price. An old tail dragger would also be a good canidate. Do not overlook the experimental AB resale market.