I had some house settling issues which were corrected with better drainage but during that time about 4 bricks shifted forward of one another and now i'd like to re-mortar them. The mortar is a light cream color.
the only mortar color available seems to be gray.
It's such a small job that tuck pointers don't want to deal with it. Could i use a sanded tile grout with a similar color? How about glass block thinset with some added sand for texture and color?

I dont know if its still available, but you used to be able to get a white cement. If you can find some, add the sand and tint it to the color you need

Take a small sample of the mortar to a local brick supplier. These places usually deal with contractors but will often sell to the general public too. Odds are that it is this kind of place that the builder used to supply both the brick and mortar - not a home store. A commercial brick supply will have dozens of choices of mortar colors to choose from. Depending on how old the house is, you may not find an exact match but you'll find something close.

Take a samplle of the morter with you.
Any concrete supply will have 1/2 X 1/2 X 1" samples to match it to.
Sounds like just Buff morter.
All there going to have is big bags but you got to do what you got to do.
Even if it's a perfect match it's going to look darker for about a month until it drys out and starts to bleach out from the sun.
For a tuck point to stay in place it needs to be about 1/2 deep.
Any easy way to apply it is to but it in a mason bag. Looks like one of those bags used when decorating a cake.
The same place you get the morter will have them.