[RPG] Is it possible to use a spell scroll with a spell that requires a bonus action to cast

The way bonus actions work is:

1. You can't take more than one bonus action per turn
2. If using an ability/spell/whatever is done as a bonus action, you can do it (bearing in mind #1)

So bonus actions aren't something you have or are granted — they are something you do up to a limit of one. Casting the spell is itself doing or taking the bonus action. Anything that is a bonus action means "you can do this on your turn, as a bonus, if you haven't already done some other bonus-type action."

D&D Basic Rules v0.1, page 69 (emphasis mine):

Various class features, spells, and other abilities let you take an additional action on your turn called a bonus action.

You never need something else to give you a bonus action before you can take a bonus action. It is only a description of the type of action it is when you do that thing. It's not a point or expendable that you collect first, and then spend. It's a type of action.

The converse is that if you don't have anything to do this turn that is a bonus action, then you can't take even one bonus action this turn.

So smoke em' if you've got em'!

Remember in D&D RAW, specific overrides general.

The general rule for scrolls "any creature that can understand a written language can read the arcane script on a scroll and attempt to activate it" is overridden by the specific rule for Spell Scrolls: "if the spell is on your class's list you can use an action to read it...otherwise the scroll is illegible". So if it's a scroll anyone can read it and use it unless it is part of the specific category of spell scrolls then it must be on your class list to a) read it and b) use it.