"Hasselt radio, OOG86 leaving the circuit and the frequency, expect back in two hours"
ICAO standard phrases and pronunciation is not intended to be rigid but can be important in a noisy environment and when English is a second language,
I would expect in accordance with ICAO; "Hasselt Radio, 00G86 departing the circuit to the East changing frequency to Brussels Information." then "Brussels Information this is OOG86 (use full callsign) departing Hasselt Keiwit VFR, negative transponder". Brussels response when they are ready to hear you will be; "OOG86
pass your message." At this point and not before you then pass your type and full routing details.
Leave out ambiguous words "just" [unnecessary] and the inappropriate "
leaving" [use changing frequency], confirming that you will tell them when leaving the frequency is superfluous because that is the rule anyway. The response therefore to Brussels info simply needs to be; "roger, regional QNH 1015, OOG86.