Just spitballing here. But I thought this would make sense for both sides:
To Kitchener:
2nds in 19, 20, 21, *24
3rds in 19, 20, *24
To Saginaw:
Damiani
Richardson
This would be part one of a two-part trade. Damiani is a 00 birthdate who'll be a front line player for the Spirit this year and next. The two conditional picks in 24 are if Damiani plays an OA year. Though not expected, if he does play an OA year, Saginaw easily gets that and more for him in return should they be in sell mode. He'd be one of the top OA's in the league.
Richardson is included to give Saginaw some insurance in net. I think he's shown signs that he'd be ok on a contender. He may be an OA option next year. This allows Lennox to be sent back down to develop properly getting #1 minutes at that level. Kitchener would have to deal for a placeholder in net on the cheap to back up Pfiel who'd get the bulk of the starts post trade deadline.
Then in the off season:
To Kitchener:
Lennox
To Saginaw:
2nd in 20
3rd in 20
Kitchener gets who they hope develops into their future #1. He'd share the crease with Pfiel next year. Then going into 20-21, a year the Rangers should contend, Lennox should be the #1.
Saginaw gets a couple picks back to use as ammunition to buy at the 2020 trade deadline as they should be going all in.
At the end of the day:
To Kitchener:
Lennox
2nd in 19, 21, *24
3rd in 19, *24
To Saginaw:
Damiani
Richardson
Saginaw buys a high end (though not elite) player and holds onto their quality youth that'll be needed this year but more importantly, next year when they should go all in. They would still have lots in the cupboard if they continue to add this year. They feel they can move Lennox as he may not be ready for the #1 role for next year's all in year.
Rangers get a couple picks in the 19 draft who they'll hope develop into key contributors two years from now when they aim to contend. And most importantly, they add hope in a highly touted, though yet unproven, goalie who, if he pans out, should be a bonafide #1 by the time they contend.