Oil based testosterone is usually long ester, or at least I’ve never seen oil based test suspension. Since you want the test to be in and out of your system within hours, I’m guessing you’ll be using water based suspension.
Reason why I wouldn’t use oil either way is because just like it sticks to your fingers unless you use an emulsifier like soap, it would probably not absorb ideally through the sublingual route.
Another thing you want to consider is jawline hypertrophy. Jaw has local receptors the test will also attach to, which in long term may cause neck enlargement. This last part is mostly anecdotal, so take this with a grain of salt. Would probably depend on the dose, absorption rate and frequency.