Hi Alfred, what you're planning seems to work for some people so you can certainly give it a shot. I hope it works out for you!
Personally, I find MXE to be far too unpredictable to rely on as a mood-lifter/stabiliser. It's just as likely to send me off on a "crazy tangent" as it is to give me a subtle mood and motivation boost - even at low doses like you mentioned.
The effect it provides also seems to change significantly depending on what else you've taken recently. So if you're like me and can't go a single day without altering yourself in some way, you can expect to get a lot of different effects from it. It gets my vote as the least predictable substance of all time... speedy, laid-back, trippy, clear-headed, ecstatic, disturbing, enlightening, confusing... MXE does them all!
It's the Swiss Army Knife of substances. Unfortunately, you can't always choose which implement you take out.
DISCLAIMER: this is just my experience, and may be more a comment on my own scattered mental state than the substance itself. Wait and see what others say.