The weight of the models without the set up touching 300 gms for a foamy seems an over estimation TG.
I would put it at closer to 200 gms.
Yes AUW 300 gms should be OK with a 2204 set up .
My fox and the Bigger Mr MOSS fly 2204 with AUW around 250 - 300 gms.
As for receiver I use a 4.3 gms Assan Rx on the Fox
You can lighten any receiver for that matter by taking off the cover and using the circuit
sai