I'd never heard that you can't use Splenda to make jelly. I wonder why?
It's been a number of years since I've done canning (16 actually...the year DD was born.

She was born in May & the poor thing screamed for the 1st 10 weeks of her life! She's a delight now, though.

) I couldn't cope with the hot kitchen & her at the same time.
Anyway, I used to pour my jam into jars & cover with parafin or put it through a hot water bath. I didn't freeze it. I just used the regular Sure-Jel and fruit - no additional sugar. Now, I wouldn't recommend that to anyone else, but I did it for years without any trouble.
One year someone wanted me to try freezer jam & I just didn't like it, but I do still have the recipe.
Freezer Jam
6 cups strawberries, halved (use only firm, ripe berries)
3 Tbl gelatin
5 Tbl cold water
1/2 cup sugar
I don't have any directions written down, but I'm pretty sure it was just mash the berries & set aside. Sprinkle gelatin evenly over the cold water & let it sit several minutes. Combine everything & bring to a boil. I don't think you even needed to cook it beyond that point.