It is not clear (at least to me), what the layout should look like.

Could you perhaps attach attach a graphic, showing the desired layout?

Like this:

In Finale 25 (or earlier versions like Finale 2011), you can notate a double string bend in guitar tablature. Just select the Note Entry Tool, click on the fret where the bend begins, then hold Shift and click on the next fret for the bend. Repeat for the second string bend. You can adjust the appearance with the Expression or Smart Shape Tool if needed. This feature is available in both versions, but upgrading to Finale 25 might offer additional benefits for your notation needs.

Thanks for your reaction!

I'll try to be more specific on this: the double guitarbend can be done on 2 (or sometimes 3) notes/strings simultaneously (one of these bends could be a half step bend, the other a whole tone bend). I can only achieve this in Finale (27.2.0.142) using the multiple layers notation, which is quite time-consuming. Otherwise Finale simply greyes out both notes that follow the bend.

The same goes for this: 2 notes are played together and one of them is bend up while the other note rings on. 

Nice.