Does this specific build to use Booming Blade at a range of 20 feet work?

Question

It has already been shown here that the booming blade cantrip and the Spell Sniper feat do work together, and here that the Sorcerer's Distant Spell Metamagic option and Spell Sniper also stack.

I am wondering if there is any reason the following build does not work:

Alice is a Bugbear multiclassed Sorcerer/Fighter (Battle Master) with the Spell Sniper feat, and she casts booming blade.

The range of booming blade is usually 5 feet. However, she has Spell Sniper which doubles the range to 10 feet, and she uses Distant Spell, which doubles the range again, to 20 feet.

She is holding a reach weapon, which has a reach of 10 feet. And she uses the Battle Master maneuver Lunging Attack, which increases the reach to 15. She then benefits from the Bugbear's Long-Limbed Feature, which increases the reach to 20.

Thus booming blade has a range of 20 feet and Alice has a reach of 20 feet, and so she can use booming blade from 20 feet away.

Is this correct? Have I correctly interpreted how these features work together to allow booming blade to work from 20 feet away?

Answer 1

As of November 10th 2020, this doesn’t work.

On November 10th, 2020, booming blade was changed to have a range of self, so is no longer eligible for spell sniper or distant spell metamagic.

Spell Sniper says:

When you cast a spell that requires you to make an attack roll, the spell’s range is doubled.

Self cannot be doubled.

Distant Spell says:

When you cast a spell that has a range of 5 feet or greater, you can spend 1 sorcery point to double the range of the spell.

Self is not 5 feet or greater.

Answer 2

Yes

Battlemaster's Lunging Strike requires a melee weapon attack:

When you make a melee weapon attack on your turn, you can expend one superiority die to increase your reach for that attack by 5 feet.

Usually, a spell would involve a melee spell attack (things like Shocking Grasp or Vampiric Touch, for example). Booming Blade is an odd duck in that in that the spell results in a melee (non spell) attack:

You brandish the weapon used in the spell’s casting and make a melee attack with it against one creature within 5 feet of you.

The spell has a range of "Self (5-foot radius)." This is kind of an odd phrasing because it's not quite just "self," which would have a range of 0 and therefore not benefit from Lunging Strike.

The 5 foot radius corresponds to the attack you make against a creature "within 5 feet of you" clause of the description. Because the 5-radius is explicitly mentioned within the range parameter of the spell, it means that you are permitted to use Lunging Strike, Spell Sniper, and/or Distant Spell Metamagic on Booming Blade.