What is tentmaking?
The term tentmaking as used today really refers to a ministry model where no distinction is made between “'sacred” and “secular”. All of our work and all of us communicate something of God's love, so that almost any job which serves the community in some way can be a platform for reaching out to people with the good news of Jesus. The very excellence of our work, the way in which we as Christians relate to people on the job, and the high standards we apply speak to unbelievers about the God we follow. People who deliberately pursue their career overseas so that they can relate face to face with non-Christians are tentmakers.
The extent to which they are involved in "actual" ministry (e.g. doing Bible study, praying, discipling) will vary greatly depending on the kind of job, location and other constraints. But the intention to make disciples must be there. The fact that your company posts you overseas does not make you a tentmaker.
The reality is that 80% or more of Asia can no longer be reached by “traditional” missionaries. Most countries simply refuse to issue visas to missionaries. They are not welcome. But professionals such as doctors, nurses, managers, IT specialists, linguists, engineers and other skilled workers are highly sought after in many nations.
A small number of Wesley members is already involved in tentmaking in various forms.
Can I be a tentmaker?
The answer to that question will be somewhat like the answer to the question: Am I called? Without a clear call, it is difficult to see how one can persevere in such a role. You would need as much prayer support and encouragement as a “regular” missionary.