The proper schwinn springers are bomb proof and also so are the aftermarket ones if you pay a reasonable price..
I have the Schwinn deluxe 7 with coaster/v brake and kelvar pads fitted with a spring type fork and that is perfectly ok for road use.
have fun with your ride
Jemma xx
PS there are also old style webb springers and open springers available but they are pricey
Looking at the Deluxe 7 Jemma it looks like it has a 6" headtube whereas the Alloy 7 has a 7" headtube and I think this is the problem why none of the aftermarket springers will fit. I'm now resigned to staying with the rigid forks but I would have wasted time looking for a second hand Deluxe 7 until your message prompted me to overlay a photo of one against the other. Schwinn themselves don't produce or supply aftermarket parts. Strangely enough the Schwinn Alloy DX 2007 model has a springer that looks to be of a length halfway between the Alloy 7 & the Deluxe 7 but that's still not the right length. The 2008 alloy DX uses the Schwinn Ashtabula Style Flat Blade w/ Forged Crown & Truss Rods which isn't really a springer fork and now the only model with a true springer is your Deluxe 7.
You said you have a V-brake and I wasn't aware of any v-brakes on any Schwinn cruiser except the Alloy 7 which is why I bought it. Maybe you have an aftermarket springer that has the v-brake bosses welded on like what Micargi sell. The reason I like the new Felt Heritage so much is because it has springers and v-brakes front & back plus it has a long wheelbase and looks like it would be supremely comfy with a Honda motor. Don't know if they sell them in UK but they don't sell them here in Oz.
The Monark fork came closest to fitting the bill for me its 7&1/8" long and 1" dia. but the adaptor kits they supply for the newer 1&1/8" dia. headtubes are only for threadless tubes & mine is threaded.