LotFP Multiclassing/Hybrids

Last post, I was chewing on the way LotFP classes work. In the time between, I came up with the following. It needs some testing, but I like the idea:

LotFP Hybrid Classes

In addition to the four traditional classes, human characters can instead choose to play a hybrid class. Each hybrid consists of a blend of two of the core classes, gaining some of the strength of each but not the full benefits thereof.

Pick two of the following to gain your core benefits:

Cleric: Casts Cleric spells as a cleric of half their level. Cannot be combined with Magic-User.
Fighter: Gains all fighter combat options and begins with a +2 Attack Bonus, but their attack bonus never increases.
Magic-User: Casts Magic-User spells as a Magic-User of half their level. Cannot be combined with Cleric.
Specialist: Pick two skills. Each of these begin at 2 dots. One of these may increase each level.

If the character is a hybrid class that has spells, they will for all rules purposes (spells per day, learning spells, spell effects) be considered a caster of half their level. If you are a Cleric/X hybrid at level 10, you will in all ways act as though you were a level 5 cleric for the purposes of magic rules. You begin with no access to spells at level 1.

Saves will be identical to one of the parent classes. The player may choose which.

XP will be equal to the highest XP class x1.5. Thus, to get to level two a Fighter needs 3000, Cleric needs 2625, Magic-User needs 3375.

Niche protection shouldn't be an issue. Each of the core classes will always be better at their job than the hybrids. There is slightly closer competition with the demihumans but each demihuman gets a benefit that the hybrids can't and they universally have a lower xp requirement for what they are trying to do.

The applications of the above create a lot of interesting concepts. Paladins or witch-hunters could easily be fighter/clerics or even cleric/specialists.  Fighter/Specialist in particular opens up nice possibilities as a ranger or assassin. Magic-User/Specialist could even be used for a bard, god forbid.

I'll have to test this more before I decide if I like it, but it would actually handle most of the concepts I was considering making alternate classes for without deviating much from the core rules.