Hi, sorry I just found this website, not too late for a suggestions.
As I knew glyceryl monostearate is used as an emulsifying agent especially in lotion
making. There are some simple emulsifying agents such as emulsifying wax NF,
Xanthan, grated cold process soap, natural liquid soap, parmagel B, methyl cellulose
& so on. If you are allergic to one of them you still have a lot to select. I’m using
emulsifying wax , it is easy to use and inexpensive. GMS has an low HLB Value
which is so you need to add like polysorbate 20 , NF which has HLB Value
to make it effective.