The cheapest way is to use the bucket curl circuit, the only problem with that is you could get bleed down on the curl cylinders and have to swap hoses back for a second to retract curl cylinders.
That would be a little bit of a PITN, if it were me I would figure a way to prevent the bleed down, with a strap or pin etc.
If you don't foresee the need for other hydraulic applications at the front, then using the curl circuit would be the way to go IMO. basically 2 hoses from your plow to the QD for the loader, swap the curl lines for the plow lines.
The other options like diverters and 3rd SCV are costly, but more professional and can be used for other add ons in the future.
As far as the shorter plow goes, the downside is you will have to make a few more passes, the upside is you will be able to push much deeper/heavier snow.
Good luck. JB.