The cheapest option is to replace the Losmandy dovetail on the scope with a long Vixen dovetail.
The next mid-range price option is and ADM D to V converter that fits into your existing Vixen saddle that coverts Vixen to Losmandy.
The most expensive option is to replace the Vixen assembly on the mount with an ADM DV assembly which would give you access to both Vixen and Losmandy connections. This option is requires some technical skill because you have to remove the DEC motor along with the Vixen assembly. The ADM replacement does require drilling or filing to widen the slot to remount the DEC motor in order to use the existing bolts.
I chose the last option because I personally do not trust saddle connections that use screws for a large scope.
It is all a matter of preference.
Mounts: ES PMC-8 G-11, ES PMC-8 EXOS-2, ES PMC-8 iEXOS-100
Scopes: ES ED127 FCD-100, Askar FRA400, Askar FRA600, ES N208CF, QHY Mini Guide Scope, Solomark F60 Guide Scope
Cameras: QHY600M, QHY128C, QHY168C, QHY183M
Misc: MoonLite CFL 2.5 / High Res Stepper / V2 Mini Controller, Baader SteelTrack NT / SteelDrive II, Baader UFC, Optolong 2" L-Pro / L-eNhance / L-Extreme, QHY CFW3-L, Baader 2” LRGBSHO CCD, Primaluce Lab Sesto Senso 2, QHY CFW3-S, Optolong 1.25” LRGBSHO CCD
Imaging Software: NINA, APT, SharpCap Pro
Processing Software: PixInsight, Lightroom, Premiere Elements