Lesser Holy weapon enhancement?

[Ambrus]

I have a character who's been saving some cash to have his magical weapon enhanced beyond it's simple +1 bonus. Ideally I'd like to have it made Holy, but waiting to accumulate 14,000 gp will take longer than I'd prefer to wait. I mean, while I sit on all this cash my character remains effectively under-equipped for his level.

Just as it's possible to enhance magical weapons in increments (i.e. +1, +2, +3...) it occurred to me that it might be feasible and preferable to devise a "lesser" Holy enhancement (equal to only an extra +1 bonus); sort of a stepping-stone to eventually have it made truly Holy (equal to an extra +2 bonus). It would cost less up front for a weaker version of the weapon without my having to wait to benefit from spending my cash sooner. Later, when I have more funds available, I could then have the weapon enhanced and have the true Holy effect replace the lesser-holy effect.

Does such a Lesser Holy enhancement already exist somewhere in some form? If not I'd propose that a weapon with such an enhancement could deal an extra +1d6 damage against evil opponents, would not yet count as a good aligned weapon and would be the equivalent of a +1 weapon enhancement. Does this sound fair and reasonable?

 

[Evilhalfling]

I believe there is a profane power in Liber Mortis - which does exactly what you propose only [evil] there might even be a +1 quality called sacred.

BoED has Blessed - as the paladin spell, as a +1 quality

DMG2 has Holy surge +2000 gp, useable x times per day.

IMC the party has weapons with 2 of these, and they are still looking for a holy weapon as well - silly demonhunters.