I have used the curved nose syringes for many years. I used them a lot cleaning my fountain pens. You can snip the end of the nose off to get just the amount of grease or other flow you want. You can get them at hobby shops.
As for the Tri-Flow vs regular SM lubes, it is better. I've never said regular grease or oil is bad, just that Tri-Flow is better.
Here is one example: We have a newer Singer 4622A ZZ with built in patterns machine. Plastic gears of course. We got it at a yard sale for less than 5.00. When we'd take it down to sew with it the ZZ mechanism would be sluggish. We would have to sew with it on scraps for a while until it started working. Then I got Tri-Flow and tried some in that mach. I let it sit over night and then started to sew. You should see the difference. It started right off normal. That right there sold me on Tri-Flow. I still have regular oil and grease, but I keep the Tri-Flow for the good things.
Joe