even when you have to pay various expenditures, ....
「出費多端の折」は
even when you have to pay various expenditures, ....
のように表現できるかと思います。
to pay various expenditures で「様々な費用を支払う」
例：
Thank you for supporting us even when you have a lot of expenditures to pay.
「出費多端の折、ご支援いただきありがとうございます」
ご参考まで！
We truly appreciate your continued support, especially during this time of rising expenses.
**We truly appreciate your continued support, especially during this time of rising expenses.**
「支出が増えるこの時期にも、変わらぬご支援をいただき、心より感謝申し上げます」
*especially during this time of rising expenses* は「出費多端の折」を丁寧に表現しています。
2. **Your continued trust means a lot to us in these financially demanding times.**
「こうした財政的に厳しい時期におけるご信頼に、深く感謝しております」
*financially demanding times* で「金銭的に大変な時期」を上品に伝えます。
カナダ 
アメリカ合衆国 
