Yes: Since you can use witch levels to qualify for Craft Magic Arms and Armor, your level prerequisite is satisfied, and the arcane bond allows you to count as having that feat when enhancing your fancy sword. This would also apply if you were a cleric or ranger, since the level prerequisite doesn't mention needing an arcane caster level.
Class features ...
No, I'm afraid not. P164 in the Players Handbook explains that each class prepares spells as if it were single classed.
Spells Known and Prepared. You determine what spells you know and can
prepare for each class individually, as if you were a single-classed
member of that class. If you are a ranger 4/wizard 3, for example, you
know three 1st-level ...
I went a bit of 'rogue' with my direction. Hah, see what I did there?
Anyway, it actually built better due to the roleplay of our game, but currently my character is 15 Arcane Trickster/2 Grave Cleric.
To review as a 18 Arcane Trickster/2 Grave Cleric:
Sacrifice : Capstone of rogue & 1d6 sneak attack damage.
1. Little extra healing, ...
Druid 12/Cleric 5/Rogue 3 probably best but Druid 14/Rogue 3/Cleric 3 has some cool options
Prioritizing level 6 in druid with conjuring is powerful and advances all your goals.
Before I go into evaluating endgame potential of lvl 20 builds, I would argue your character's next big power spike will be druid level 6.
On Druid 5 you will gain ...
I would recommend Druid 12/Rogue 3/Cleric 5
If your goals are healing and buffing, then more levels in Cleric would allow you to gain access to their 3rd level spells, some of which are related to buffing and healing (i.e. beacon of hope and revivify, which are domain spells for you, and mass healing word). You will also gain more spell slots by taking more ...
Fair is not a rule in the documentation
But there are no published methods to allow re-spelling a character.
There are many home-brews (changes to or additional rules) that allow players to re-work spells they know at level-ups or other points in an adventure. But there is no allowance in the documentation that allows changes of know spells based on a ...
Older UA content used to suggest against multiclassing
UA articles presenting new subclasses used to include the following line in the "This is Playtesting Content" sidebar that precedes every UA content.
As is typical in Unearthed Arcana, the options here haven’t been tuned for multiclassing.
The most recent UA article to include such observation was "...
Yes, Desciple of Life clearly triggers when using Healing Spirit.
Let's adress the rules first. Disciple of Life states 3 conditions:
use a spell
of 1st level or higher
to restore hit points to a creature
Healing spirit is a spell of 1st level or higher that you can cause (use) to restore hitpoints. It almost word for word fulfills the conditions ...
A case of Rules and Interpretation
The spell appears to meet the requirements for Disciple of Life every time someone enters its space. The requirements for Disciple of Life state that...
Whenever you use a spell of 1st level or higher to restore hit points to a creature
you gain the benefits of...
the creature regains additional hit points equal to ...