Unless someone wants go and develop their own cold launch solution it would have to be from MBDA's stable as they own the SVL method, and unless its their product or a partner I can't see them giving it out. That realistically means CAMM family members and whatever else MBDA (primarily UK division) has available. Realistically its not going to be over 250kg. In terms of their current product catalogue, and what a purchaser of a VL for a smaller vessel, or as a supplement for a larger hot launch VL on the platform, which tends to be the SVL niche amongst VL systems that would mean....
CAMM
CAMM-ER
Brimstone/Sea Spear (possibly with a turnover pack, although JAGM/Hellfire launch vertically and engages)
Spear (would require a rocket booster to get to speed)
Akeron LP
Enforcer/Enforcer-X/Defendair (could potentially be dual or even tri-packed? in a single canister)
Diamond-Shaped (Canister launched Loitering Munition with 50km range)
Sea Venom (would require turnover pack and repackaging and likely be a tight squeeze, might not be possible)
Possible if it fits...and if SVL weight limit can be moderately increased and launcher has ability to contain length/greater diameter)
RCM2 (strike missile with 500kg range, would need booster and would weigh in at c450kg, above current 250kg limit)
CAMM-MR (probably above 250kg limit, but might not be by a huge margin)