I tried the LCR15 as a center channel with my VR4 JR. I was not satisfied with the match. While timbre match was not bad, the LCR15 was clearly the weak link in my system for both movies and 5.1 music. Sounds panning through the LCR15 center channel were a disappointment. IMHO the difference using the LCR15 with the VR4 SR is likely to be even more pronounced.
I replaced the LCR15 with a VR2, which was an improvement for the center channel, but still left be wanting more. My current system uses a third VR 4JR as a center channel. I bought a used pair of VR 4JR for $2000, since I could not locate a single speaker.
You may be able to find a single VR4 JR for $1K or split a pair with someone. If a VR4 JR is too high in the normal configuration, the bass module may be placed on its side with the MT module on top. In my opinion a VR 4JR would be superior in your application to any center channel in the price range.