I hate to have to be the nay sayer.. But synthesizing AAS is a whale of a task...
The level of difficulty is daunting- we're talking about impressive, multistep procedures with protective groups, and yada yada yada..
Of course it could be done.. But why?
1-You must obtain a load of glass, equipment, and potentially expensive and hard to find reagents (don't think Sigma is going to sell these to you).
2-You must have the chemical sophistication to be able to go to sci-finder, find the recipe, understand what the authors are talking about, and perform the synthesis..
3- AAS synthesis procede with a load of side reactions-- you will need a clever way to purify your product.
4-Also, you will need access to HNMR to identify and assess purity..
I'm not saying it can't be done in your kitchen... Just that you would be a hell of a lot better off buying it pre-made or even solublizing it from powder.
I've considered switching esters myself.. Now, a transesterification on an (already) parent compound doesn't seem that bad... Still, this would be more of a 'just for fun' type of thing-- ie, it's better to buy the longer ester or deal with the shorter one.
Andy