Air Carrier Cargo Captain reported while landing with malfunctioning spoilers in a gusty crosswind they received a Glideslope Warning and were slightly below glide path but continued to land instead of initiating a go around.

Narrative

We were inbound to ZZZ with MEL27-XX-X-X-X (Manual Spoilers-No Auto Spoilers). During the cruise phase of flight; we were contacted by the Dispatch regarding ZZZ Runway XXR closure and their request to reopen the runway for us has been approved by the Tower since our MEL included landing distance penalties. This concern was also noted in the release. All phases of the flight were normal including the descent phase. After review of landing performance data and performance charts with ATIS reporting winds 220 at 20G30 with good visibility; runway dry; and with ramp 3 assignment; we decided on XXR and have briefed Visual XXR back up with an ILS and with Flaps 50. During the vector on to right base XXR; scratch pad message 'ILS UNTUNABLE' displayed. With the airport in sight; we were then cleared for a visual approach to XXR.As PF (Pilot Flying) with gusty crosswind and no runway alignment guidance my focus was mostly outside. Flaps 50 configuration and associated visual cues were also little different than what I was used to. 1000 ft. and 500 ft. gates were normal and stable however; approaching minimums with gusty wind conditions aural 'Glideslope' was heard twice as I have noticed PAPI was indicating slightly low as I was correcting with Pitch and Thrust. At this point I was going to call for a 'Go Around' but since I was on a visual approach with 'ILS untunable' and current pitch and power would allow a safe landing; I decided to continue with passing the threshold at 50 ft. followed by a normal landing with flaps 50 and MED auto brakes. After landing as we were vacating the runway my immediate thoughts were; 'Why didn't I go around when first 'Glideslope' was heard...' Why was I thinking momentary deviation was acceptable in gusty condition on a visual approach...' If I was conducting a full ILS approach; I would have definitely gone around... but why was I thinking it was OK on a visual... My recommendation When any approach changes from what was briefed or expected; we should take our time and reset the box and re-brief appropriately. Don't be rushed and accept just because you are familiar with the airport. Practice No fault Go-Around policy! When in doubt!