The ATTx should work fine with the Delkims, but you could always take your alarms to a tackle shop, tell them you are looking in to buying the ATTx system and could you check to see if they are compatible with your delkims.
The only thing is it does cost around £200
ATTX 3 ROD SET 2.5mm PLUGS
The eagerly awaited Version 2 ATTx Remote System allows anglers to receive remote indication of almost any buzzer on the market! The new system not only refines and improves on the original but also includes a few new features:
New Soft Touch, non-reflective, rubberised finish on Receiver and Transmitters.
Improved Battery Life on Receiver and Transmitter - The Receiver is powered by a single AA Battery providing a battery life of up 3 weeks of normal use. The Transmitter is powered from a single GP11A battery lasting up to 1 season of normal use. Batteries are not included and are sold separately.
Low Battery Warning (very useful).
Mimics Alarm Beeps - The Receiver beeps at the same rate at which signals are received by the Transmitters, from the buzzer output, thereby sounding anything from a single bleep to a full-blown 'one-toner'.
Improved Range and Performance - tested up to 500m under optimum bankside conditions.
Multiple Tone Selection on the Receiver - 10 different user selectable tones.
Improved Transmitter Design - Re-designed to offer a smaller battery recess cover. The electronic circuitry is encased in it's own watertight compartment to prevent the risk of water coming in, transmitter corrosion and any resultant malfunction.
Activation on all LEDs (for simultaneous runs).
Last LED Activation Recall.
Increased LED 'light Up' time - LED's will remain on for 40 seconds after the last buzzer signal is received from the transmitter.
Vibrate mode and Volume control.
Full 2 year ATT Warranty - please see the ATT website for full details.
Full Compatibility with new ATT products currently under development.
Available with 2.5mm or 3.5mm Jack Plugs.
Standard system comes with 5 different coloured LED's - Red, White, Blue, Green and Orange. An 'All Blue LED' system is also available at the same price. Custom made systems with any combination of the above coloured LED's are available for £10 extra.