It is certainly ok to pray privately to uncanonized blessed ones. Local veneration is how they are eventually canonized by the Church. It would be ok to sing the magnification at the end of a pannikhida, already Bishop Nektary has done this.
The glorification will happen in God's time. (It should be done by ROCA, since that is Fr. Seraphim's jurisdiction.) It usually takes a good number of years. For recent examples of how long it can take we have St. John Kronstadt, St. Xenia of Petersburg, St. Herman of Alaska, and St. John of S&SF.