True Stike plus a +2 weapon

I have the spell True Strike and I have a +2 scimitar on my character that they are proficient in

• I tried Override the Ability Score used and damage dice on the weapon. DnD beyond wouldn't let me do that
• I tried making a custom weapon. Dnd Beyond doesn't let me add the +2 magic bonus, or the addional d6 damage die from being level 5
• I tried modifying the Cantrip itself. DnD beyond doesn't let me add an attack roll to it

What do I do?

Customize the +2 weapon stats and roll the additional damage die separately.  You can make the additional damage into a custom attack to keep it on the front page.

The components for true strike are a weapon worth 1+ cp which you make your attack with.

Casting rules also say that when a spell has both material and somatic spellcasting components the hand holding the material/focus can also be used to fulfill the somatic component (with the implication that the somatic component involves the material components in some way) Speed Test    

The way I have it on the sheet is:

• The weapon is customized for the correct attack and damage modifier for True Strike, and set for radiant
• A plain version of the weapon is on the sheet for opportunity attacks, which cannot use True Strike (not an action)
• I roll the D6 separately after. There's a button to press on the sheet for True Strike, but it's easier to just roll a plain D6 than scroll and find it.