A few things to think about:
1) Why do you want to sell ASHGEQ in favour of STXWDM? A quick graph comparing the two may suggest that STXWDM is outperforming ASHGEQ, but this is not the case, since ASHGEQ pays dividends, but STXWDM does not. Despite the higher TER for ASHGEQ, the graph looks different once you plot the total return for both. In the graph below (since the inception of STXWDM), the dark blue line shows ASHGEQ before dividends. the light blue line is STXWDM total return, and the grey line is ASHGEQ total return (the return once dividends are included). The longer the time period, the better ASHGEQ has been doing compared to STXWDM (the grey line rather than the dark blue should be considered for the full picture).
(Click on the graph to zoom)
2) ETF5IT has had an amazing run in the past year. But just about 40% of it (39.33% to be precise) is made up of just two companies - Microsoft and Apple. Since a large chunk of this ETF's performance has been due to good annual returns of these companies for this year, the annual returns next year may look different, and then the ETF may perform very differently. On the other hand, SYG4IR consists of many smaller, newer, developing companies with (possibly) more potential for long term growth. Also, in STXNDQ, exposure to Microsoft and Apple is less at only 24%, giving a more well-rounded ETF. But I get your point - the two smaller ETF's having only 5% of your portfolio each feels like they are not making any difference, so you want to combine them into one. I'm not convinced that ETF5IT will continue to do better than STXNDQ or than SYG4IR going forward, but I may be wrong.
3) Personally, I like the idea of going 20% with STXEMG. This ETF is one third China, and with emerging markets, the potential for (very) long term growth is massive. However, with this one, patience is the key. If you're planning to sell it in the next 15 years, you may as well just sell it now. This one is for the long haul, but has huge promise over the 15+ year period. Especially considering your new proposed portfolio has 70% in developed markets already, the 20% in STXEMG actually feels small. Interestingly enough, the ETFSA international portfolio product has 20% STXEMG in it.
4) I see you want to drop your local exposure from 25% to 10% by dropping NFEMOM to 10% and by selling CTOP50 and buying foreign ETFs with it. If this is the case, then why not put the extra 5% each into SYG4IR and STXNDQ, making these 10% each, rather than going 50% STXWDM? Also, I assume you have sufficient local exposure in other products (pension/RA) etc. to warrant the drop here?
5) Personally, I prefer your existing portfolio more than your new proposed one. However, if you do want to go only 10% local, if it were me, I'd do:
ASHGEQ - 40%
STXEMG - 20%
GLPROP - 10%
NFEMOM - 10%
SYG4IR - 10%
STXNDQ - 10%
6) Importantly, don't make the mistake of selling the 5% NFEMOM just so your portfolio gets to its new percentage allocation quicker. If you are going to drop the allocation to 10% , just hold on to what you have and don't buy more until it's just 10% of your portfolio.
7) P.S. Welcome to the forum!